Polyisobutene
聚异丁烯; 聚异丁烯
🗣️ 情景例句
I just can't understand
我就不懂
Sound in body, sound in mind.
有健全的身体才有健全的精神。
Where're Lucy's pencils? Are they on her desk?
露茜的铅笔哪去了？在她的桌子上吗？