Polysulfone
[化] 聚砜; 聚砜類
??? 情景例句
About three weeks. We'll have enough time for our talks.
大約三個禮拜，我們有足夠的時間交談了。
The accident held the train up for an hour.
那事故使火車延誤了一個小時。
I think May is the best month.
我認為5月最好。