Polyanhydride
[化] 聚酐
🗣️ 情景例句
My mother is a housewife and my father is retired.
我妈妈是家庭妇女，我爸爸退休了。
How much does a round trip ticket to go there cost?
一张去那边的往返票要多少钱？
Where are you from?
你从哪儿来的？