Pfeiffer's substance
[化] 普法伊费尔化合物
🧩 词语组成解析
🗣️ 情景例句
Mary, what's your favorite sport?
玛丽，你最喜欢什么运动？
We used to have a lot of fun when we were that age.
当我们是变老时，我们过去常有很多趣事。
You'd better look before you leap.
你最好三思而后行。