Perfluoroethylene
[机] 四氟乙烯
🗣️ 情景例句
IT is no longer the growth industry it once was.
信息科技业的增长不再像以前那样快。
Some do it for an endless pursuit of profit, and others, for the sake of the well-being of the society.
有人做生意是为了无止境的追求利润，有的人是为了社会的繁荣。
He did very badly on the exam----worse than expected almost the worst in the class.
他考的不好，比期望的还糟。几乎是全班最差的。