Polyanhydride
[化] 聚酐
🗣️ 情景例句
There's always a friend around when you need one.
当你需要朋友帮忙的时候，总会有朋友在你身边的。
Why didn't you try again?
为什么你不再试一次？
Even really honest people are often made to feel guilty.
甚至是最诚实的人也常弄得觉得有罪似的，