A.eliminating | B.clarifying | C.responding | D.emerging |
bound; emerge; rely on; in particular; stressed out; abuse; decide on; proceed to; be fond of; be worth of |
1. After talking about the budget, we will
2. The train
3. Besides, with the development of the new industry, there also
4. I always showed my respect and love to the old, my grandparents
5. I
6. When you feel
7. We all think it wrong to
8. Have you
A.emerging; coated | B.rumbling; coated | C.emerging; masked | D.rumbling; masked |
A. emerge B. absorbing C. subject D. defining E. movement F. originally G. course H. universally I. happens J. constant K. corresponds |
How Long Is a Second?
The length of a second depends on how you’re measuring it. There are 24 hours in a day, 60 minutes in an hour, and 60 seconds in a minute — so surely a second is 1/86400, of a day, right? Well, it turns out that
“The second was
In the 16th century, people turned to technological solutions to this problem, and the first recognizable mechanical clocks began to
By around 1940, quartz crystal clocks (石英钟) had become the new gold standard. However, problems arose, and this was where atomic clocks came in. “Atoms exist only in particular energy states and can only change from one state to another by
In fact, scientists are discussing whether it’s time to redefine the second again. But while several important questions still need to be answered before this