Bargh
矿山企业
🗣️ 情景例句
The book is worth reading.
这本书值得一读。
That's all for today.
今天就讲到这里。
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。