Perfluoroethylene
[機] 四氟乙烯
??? 情景例句
Always remember to wash your hands before eating.
用餐前謹記要洗手。
The leopard cannot change its spots.
江山易改，本性難移。
Then they arrived just when we wanted them.
這樣，他們可以恰好在我們要求的時間到達。