Etfe
[医][=ethylene-tetrafluoro-ethylene]乙烯四氟乙烯
🗣️ 情景例句
Why are you leaving your present job?
你为什么要放弃目前的工作？
The world is a ladder for some to go up and others to go down.
世界好似一把梯，有人上去有人下。
So far, no man has travelled farther than the moon, but spaceships without people have reach other parts of the universe.
到目前为止，尚未有人到过比月球更远的地方，但无人驾驶的宇宙飞船已到达过宇宙的其它地方。