单词：cesium-beam clock
单词：cesium-beam clock 相关文章
[00:06.37]The United States has a new official clock. [00:10.95]The clock began operating late last year in the American city of Boulder,Colorado. [00:18.39]Experts say the new clock is so exact that it will neither gain nor lose so much as one secon
美国英语听力80篇
Talking clock 会说话的钟 While proudly showing off his new apartment to friends, a college student led the way into the den. What is the big brass gong and hammer for? one of his friends asked. That is the talking clock, the man replied. How's i
趣味英语
Youve given some thought to oxygen, carbon, uranium. But youve probably never mused about the element ytterbium, symbol Yb. A new study by scientists at the National Institute of Standards and Technology, or NIST, says that ytterbium could find a rol
Scientific American(八)月
Very good, replied the dial; but recollect that, although you may think of a million of strokes in an instant, you are required to execute but one; 很好，表盘说道，不过，你想一下，虽然，你或许考虑顷刻间需要一百万次滴答
美国语文第五册
Grandfather's Clock Artist：平井坚 My grandfather's clock was too large for the shelf So it stood ninety years on the floor It was taller by half than the old man himself And it weight not a penny's weight more It was bought on the morn that my g
好听的英文歌曲
My Cock ClockHello! My name is Dongdong. Do you know I have a nice clock? It is a beautiful clock. It is in my bedroom. In m\fact it is an alarm clock. The big and round body is made of plastics and the clock is set in it. There is a red comb on its
英语美文