Cistine
氨基酸
🗣️ 情景例句
We would adopt payment by instalments for our present practice,
这次交易我们将采取分期付款方式，
He might have been held up in a traffic jam.
他可能因交通阻塞而耽搁了。
Certainly, Mum! What shall we cook?
当然啦，妈！ 我们做什么菜？