Pentafluoride
五氟化物
🗣️ 情景例句
OK. I understand. Thank you.
好吧，我懂了，谢谢你。
Excuse me,sir.Can you give me some information
对不起,先生.你能给我一些信息吗？
Aeroplanes have the reputation of being dangerous and even hardened travellers are intimidated by them.
飞机以危险而著称，连老资格的旅行者也怕飞机。