Tetrafluoride
n. [化]四氟化物
🗣️ 情景例句
Tell me about your educational background.
告诉我你的学习背景。
My sister worked as a secretary before she got married.
在她结婚了以前，我的姐姐为一位秘书。
Lying and stealing are immoral.
说谎和偷窃都是不道德的。