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题型:选词填空-短文选词填空 难度:0.4 引用次数:187 题号:7442313

The Father of 3D Printing

About twenty years ago, the surgeons at the Wilford Hull medical center working to separate a pair of conjoined(连体的) twins thought that only one would be able to walk after the operation. After a model of the girls’ bone structure was     1     using 3D printing, however, they found a shared upper leg bone to be bigger than expected and split it successfully,     2     in both twins being able to walk. Now eighty and still working as chief technology officer of 3D Systems. Chuck Hull is enjoying some minor     3     31 years after he first printed a small black eye-wash cup using a new method of manufacturing known as 3D printing.

At the time, he was working for a company that used UV light to put thin layers of plastic coats on tabletops and     4    . He had an idea that if he could place thousands of thin layers of plastic on top of each other and then cut their shape using light, he would be able to form three dimensional objects. After a year, he     5     a system where light was shone into a bottle of photopolymer – a material which changes from liquid to plastic-like solid when light shines on it – and traces the shape of one level of the object. Subsequent layers are then printed until it is     6    .

After patenting the invention, he set up 3D Systems,     7     getting $6m (£3.5m) from a Canadian investor. The first     8     product came out in 1988 and proved a hit among car manufacturers, in the aerospace sector and for companies designing medical equipment. The possibilities appear endless – from home-printed food and medicine to     9     that pictures of objects be able to be taken in shops and then recreated using plans downloaded from the Internet Although deliberate in his responses, there is one moment when the     10     spoken Chuck Hull tells of his surprise about what exactly his creation was capable of achieving.

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The Father of Cool

It is evening, near freezing. The city is practically empty. Fog     1     the Pittsburgh Railroad Station. A young engineer walks the platform, his brain occupied with a problem that has obsessed him for months. And then it     2     him—the Archimedean lightning bolt (闪电) of inspiration. The answer is literally all around him: It’s the fog itself!

The young man’s name is Willis Haviland Carrier. On that foggy night in 1902, he hit upon the theory that became the     3     for modern air-conditioning technology.

Carrier graduated from university as a mechanical engineer in June 1901. A month later, he began working for the Buffalo Forge Company, a firm that   produced heating and exhaust systems     4    . The summer of 1901 was     5     hot. A printing company became frustrated with varying humidity (湿度) levels when trying to print in color. The same paper had to be printed four times in four colors, and if the humidity changed between print runs, the paper would slightly expand or     6    . Even a millimeter’s misalignment (错位) looked awful.

Early the following year, the printing company     7     Buffalo Forge, asking it to devise a system to control humidity in the air as well as the temperature. The firm turned to the 25-year-old Carrier.

By the early 1850s, two     8     in cooling had been achieved: a French engineer designed the first absorption refrigerator; and an American physician was     9     a patent for a machine to make ice. From then on, the challenge would lie in controlling humidity instead of lowering temperature.

Carrier’s partial solution involved circulating cold water and then balancing their temperature with the rate of air flow. It was at the Pittsburgh Railroad Station that the solution came to him. Few other inventors have had such an impact on modern life and yet remained so little-known. Air conditioning, in a sense, has become     10    . And for most of us, the simple ability to cool our homes amid the summer’s heat is more than enough reason to be grateful for Carrier’s fogbound moment of genius.

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E-Scooters

Over the past two years, electric scooters have become ever-present in many of Europe and America’s biggest cities. Britain is the last major western European country to hold out against the     1     . E-scooters are not allowed on public roads, though people do ride them on cycle     2     and pavements . But where they are permitted, the number of e-scooter sharing companies soars     3     . To their     4     , e-scooters are revolutionary: the “iPhone Of urban transport”. To their critics, they are dangerous, anti-social and very annoying.

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