Aerotex
甲醛, 三嗪聚合物
🗣️ 情景例句
You may be offered coffee, and then you should immediately announce the reason for your visit.
他们会给你冲咖啡，然后你应该尽快说明来意。
All work and no play make Jack a dull boy.
尽量学，尽情玩。
What about those shoes over there?
那边的那些鞋如何？