Polythioester
[化] 聚硫酯
🗣️ 情景例句
What university are you attending?
你现在就读于哪所大学？
If you always say NO,never be married.
常常说“不”字，永远难结婚。
Tie a heavy weight at the end of a long piece of string.
把一个重物拴在一根长绳子的一端，