Polyisobutylene
n. [化]聚异丁烯
🗣️ 情景例句
I'm sure glad you're here, Grandpa.
您来这里我真高兴， 爷爷。
She is free any time you need help.
你需要帮忙时，请随时向她求助好了。
The Turners are going on a train. The conductor is coming round.
特纳一家人在火车上。列车员走过来。