Polyfluorination
多氟化反应
🗣️ 情景例句
Here we are.
所以我们才有缘相见。
If it hadn't rained so hard yesterday, we would have played tennis.
如果昨天没下那么大的雨，我们就去打网球了。
Two main techniques have been used for training elephants,
驯象有两种主要的方法，