Phenolphthalol
[化] 酚酞醇
🗣️ 情景例句
He is still unable to express himself in English.
他仍然不能用英语表达自己的意思。
Thank you for attending today's meeting.
谢谢你出席今天的会议。
Imagine a pen attached to the weight in such a way that its point rests upon a piece of paper on the floor.
假定把一支笔拴在重物上，笔尖落在地板上的一张纸上，