Polyfluorination
多氟化反应
🗣️ 情景例句
Who's the valedictorian of this class?
谁是班里优秀的毕业生？
There was much news in the morning paper today.
今天的晨报上有许多新闻。
A blurred image appears; he adds a brushstroke and another, and it is gone;
一个朦胧的形象出现在作家的脑海里，他左添一笔，右添一笔，形象反而消逝了；