Circinus
n. <拉>[天]圆规座
🗣️ 情景例句
I've seen pictures of him.
我见过他的照片。
I ask him to wait a few minutes.
我要求他等几分钟。
It is the natural frequency of emission of the hydrogen atoms in space and was discovered by us in 1951;
这个频率是空间氢原子释放的自然频率，是在1951年被人类发现的。