2 . Tiny as they are, bats have the ability to “see” in the dark by using a special skill called echolocation (回声定位法). They make noises and wait for sound waves, or an echo, to bounce (反弹) back off objects. They can tell the distance of various objects by how quickly the sound waves bounce back off them. If no sound bounces back, they can then fly forward.

This special ability has been simulated in the human world for a long time, such as in submarines and planes, whose sonar (声呐) systems are somewhat similar to echolocation. But apart from helping vehicles “see” where they are, what if blind people could use echolocation for themselves? It turns out, some already are.

American Daniel Kish, who is blind, is known as “Batman”. This isn’t because he walks around in a cape (披风) and a mask, but because he has a bat-like ability to locate where he is through sharp clicks he makes by moving his tongue against the roof of his mouth. Kish is so skilled at echolocating that he can ride a bike and hike on his own.

Recently, research carried out at the University of Durham in England shed (揭示) some light on the power of human echolocation.

Kish worked with a group of scientists who studied the way blind people listen to the echoes that they produce from clicks.

The team, which conducted experiments with other volunteers, found that people were capable of hearing even very faint echoes, ones far fainter than had been previously thought.

Speaking to The Independent, Lore Thaler, lead scientist of the group, said, “We found that in some conditions, they were really faint — about 95 percent softer than the actual clicks, but the echolocators were still able to sense this.”

Andrew Kolarik of the University of Cambridge is another expert in echolocation. Reacting to the Durham study, he told BBC News that echolocation “can be very useful at providing information at face or chest height” and could help people “avoid objects like low hanging branches that might not get detected by the cane (盲杖) or a guide dog”.

Although Kish’s skill is remarkable, there’s hope for other blind people who want to use echolocation. According to BBC News, echolocation is a skill blind people can acquire and develop, just like learning a language. As Kolarik said: “Teaching echolocation skills could provide blind people with the means of exploring new places.”

6 . An introduction to this book is as superfluous as a candle in front of a powerful searchlight. But a convention of publishing seems to require that the candle should be there, and I am proud to be the one to hold it. About ten years ago I picked up from the pile of new books on my desk a copy of Sons and Lovers by a man of whom I had never heard, and I started to race through it with the immoral speed of the professional reviewer. But after a page or two I found myself reading, really reading. Here was—here is—a masterpiece in which every sentence counts, a book packed with significant thought and beautiful, arresting phrases, the work of a remarkable genius whose gifts are more richly various than those of any other young English novelist.

To appreciate the rich variety of Mr. Lawrence we must read his later novels and his volumes of poetry. But Sons and Lovers reveals the range of his power. Here are combined and blended(混合的) sort of “realism” and almost lyric(抒情的) imagery and rhythm. The speech of the people is that of daily life and the things that happen to them are normal adventures and accidents; they fall in love, marry, work, fail, succeed, and die. But of their deeper emotions and of the relations of these little human beings to the earth and to the stars, Mr. Lawrence makes something near to poetry and prose(散文) without violating its proper “other harmony.”

Take the marvellous paragraph on next to the last page of Sons and Lovers (Mr. Lawrence depends so little on plot in the ordinary sense of the word that it is perfectly fair to read the end of his book first):

Where was he? One tiny upright speck of flesh, less than an ear of wheat lost in the field. He could not bear it. On every side the immense dark silence seemed pressing him, so tiny a spark, into extinction, and yet, almost nothing, he could not be extinct. Night, in which everything was lost, went reaching out, beyond stars and sun, stars and sun, a few bright grains, went spinning round for terror, and holding each other in embrace, there in the darkness that outpassed them all, and left them tiny and daunted(气馁). So much, and himself, infinitesimal, at the core a nothingness, and yet not nothing.

Such glorious writing lifts the book far above a novel which is merely a story. I beg the reader to attend to every line of it and not to miss a single one of the many sentences that await and surprise you. Some are enthusiastic and impressive, like the paragraph above; others are keen, “realistic” observations of things and people. In one of his books Mr. Lawrence makes a character say, or think, that life is “mixed.” That indicates his philosophy and his method. He blends the accurately literal and trivial(琐碎的) with the extremely poetic.

To find a similar blending of tiny daily detail and wide imaginative vision, we must go back to two older novelists, Hardy and Meredith. I do not mean that Mr. Lawrence derives(源于) immediately from them or, indeed, that he is clearly the disciple(弟子) of any master. I do feel simply that he is of the elder stature(名望) of Hardy and Meredith, and I know of no other young novelist who is quite worthy of their company. When I first tried to express this comparison, this connection, I was contradicted by a fellow-critic, who pointed out that Meredith and Hardy are entirely unlike each other and that therefore Mr. Lawrence cannot resemble both. To be sure, nothing is more hateful than forced comparisons, nothing more boring than to discover parallels between one work of art and another. An artist’s mastery consists in his difference from other masters. But to refer a young man of genius to an older one, at the same time pronouncing his independence and originality, is a fair, if not very superior, method of praising him.

7 . I read somewhere that we spend a full third of our lives waiting. But where are we doing all of this waiting, and what does it mean to an impatient society like ours? To understand the issue, let’s take a look at three types of “waits”.

The very purest form of waiting is the Watched-Pot Wait. It is without doubt the most annoying of all. Take filling up the kitchen sink(洗碗池) as an example. There is absolutely nothing you can do while this is going on but keep both eyes fixed on the sink until it’s full. During these waits, the brain slips away from the body and wanders about until the water runs over the edge of the counter and onto your socks. This kind of wait makes the waiter helpless and mindless.

A cousin to the Watched-Pot Wait is the Forced Wait. This one requires a bit of discipline. Properly preparing packaged noodle soup required a Forced Wait. Directions are very specific. “Bring three cups of water to boil, add mix, simmer three minutes, remove from heat, let stand five minutes.”I have my doubts that anyone has actually followed the procedures strictly. After all, Forced Waiting requires patience.

Perhaps the most powerful type of waiting is the Lucky-Break Wait. This type of wait is unusual in that it is for the most part voluntary. Unlike the Forced Wait, which is also voluntary, waiting for your lucky break does not necessarily mean that it will happen.

Turning one’s life into a waiting game requires faith and hope, and is strictly for the optimists among us. On the surface it seems as ridiculous as following the directions on soup mixes, but the Lucky-Break Wait well serves those who are willing to do it. As long as one doesn’t come to rely on it, wishing for a few good things to happen never hurts anybody.

We certainly do spend a good deal of our time waiting. The next time you’re standing at the sink waiting for it to fill while cooking noodle soup that you’ll have to eat until a large bag of cash falls out of the sky, don’t be desperate. You’re probably just as busy as the next guy.