Catecholborane
儿茶酚硼烷
🗣️ 情景例句
Now would be a good time, I think, for some introductions.
我想，下面是作些介绍的时候了。
He's very fond of playing tennis.
他非常喜欢打网球。
What was the population of the less developed countries in 1950?
1950年不太发达国家的人口是多少？