Substituent
高中 Senior Highn. 取代基, 代替物\\na. 取代基的, 代替物的
🗣️ 情景例句
Is it all right if I use a letter of credit?
如果我使用信用证，没关系吧？
They are used to seeing him every day.
他们习惯了每天见到他。
I hope not. She says she's got a headache and a cough. Perhaps she's caught a cold.
我也但愿如此。她说有点头痛，还咳嗽。也许是感冒了。