Polyisobutylene
n. [化]聚异丁烯
🗣️ 情景例句
You'd better watch your step or you'll get into trouble again.
你最好留点儿神， 免得再惹麻烦。
Excuse me I couldn't tell you beforehand.
对不起我不能事先告诉你。
But when the train dawdled at station after station, I began to wonder,
但是，当火车一站接着一站往前蠕动时，我便产生了怀疑。