Trifluoride
三氟化物
🗣️ 情景例句
Men and women, young and old, to give us their time.
不管男女老幼 ，请他们贡献时间。
Time past never returns, amoment lost, lost for ever.
过去的时间决不返回，浪费一点，永远消失。
No, there aren't (any).
不，没有。