Phosphinate
亚膦酸盐, 亚膦酸酯
🗣️ 情景例句
There are a lot of beggars on the street, how can we help them?
街上的乞丐那么多，我们怎么能帮助他们呢？
Why didn't you write me?
为什么你不给我写信？
I have been putting on weight.
我开始发胖了。