Pyrazinyl
吡嗪基
🗣️ 情景例句
I've been thinking a lot about our responsibilities
我对于我们的职责想了很多
A little labour, much health.
适量劳动健身大有益。
I used to travel by air a great deal when I was a boy.
我在幼年的时候，曾多次乘飞机旅行。