Polyazin
[医] 多氮化合物
🗣️ 情景例句
and I can give you and Mrs. Stewart a month of classes free.
我让你和你太太免费上一个月的课。
As you all know, doing business is not an easy thing to do.
大家都知道，做生意并不是一件容易的事。
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。