Seismographer
n. 地震学者
🗣️ 情景例句
Ellen.
Ellen。
And to stay ahead of the competition is to openly and freely exchange our opinions.
处于竞争领先地位的方法就是公开、自由交换我们的想法
The Hubble telescope was launched into space by NASA on April 20,1990 at a cost of over a billion dollars.
哈勃望远镜于1990年4月20日由国家航空航天局发射升空，耗资10多亿美元。