Pentafluoride
五氟化物
🗣️ 情景例句
Hi, Alexandra.
嗨， Alexandra。
To learn obeying is the fundamental art of governing.
学会顺从是管理的基本艺术。
I have just received a letter from my old school, informing me that my former headmaster,
我刚刚收到母校的一封信，通知我说以前的校长