Polyacetals
聚缩醛(树脂)
🗣️ 情景例句
It's common practice.
这是惯例。
He that will eat the nut must first crack the shell.
欲所得，必先劳。
Tod, you will send these things to the gentleman's address.
托德，你把这些衣服送到这位先生的住地去。