Polyisobutene
聚异丁烯; 聚异丁烯
🗣️ 情景例句
Is this your first trip to China?
这是你第一次到中国吗？
You are darker than I am.
你比我黑。
Warn the trucking company to take it easy.
吩咐卡车运输公司要小心啊。