Retrosynthesis
[化] 逆合成
??? 情景例句
It's too crowded in the bus. I think I'll have to get off to walk the rest of the way home.
車上太擠了，我想剩下的路我必需下車走路回家。
Is this your book?
這是你的書嗎？
It's time I went and picked up my little girl from school.
我該去學(xué)校接我的小女兒了。