Polypak
苯乙烯、二乙烯苯共聚物
🗣️ 情景例句
you had some doubts about wanting to go to Michigan.
你对上Michigan大学有些疑虑。
He who would climb the ladder must begin at the bottom.
爬梯必须从底层开始。
OK. Thanks.
好吧。谢谢。