Bravais'law
[電] 布拉格定律
??? 情景例句
And when I did,
就算我睡著了，
Tractors have revolutionized farming.
拖拉機(jī)使耕作有革命性的變化。
We can also use satellites to help us make telephone calls to foreign countries.
我們也能利用衛(wèi)星幫助我們打國際電話。