Polybutylenes
聚丁烯
🗣️ 情景例句
Don't worry. She'll be fine.
不要担心， 她会好的
I'm sorry. I was just playing football with my friends.
对不起，我只是和朋友去踢了足球。
One authority on spiders made a census of the spiders in grass field in the south of England,
一位研究蜘蛛的权威对英国南部一块草坪上的蜘蛛作了一次调查。