Dialkylphosphinate
二烃基亚磷酸酯
🗣️ 情景例句
Sit down. Sit down.
请坐。请坐吧。
Would you please pass the salt?
请您递给我盐。
First of all, they may have come to this planet of ours thousands or millions of years ago,
首先，他们可能在几千年前或几百年万年前已来过我们地球，