Polydiolefin
聚二烯烃
🗣️ 情景例句
He's an aerospace engineer,and works for Orlando Aircraft Corporation.
他担任航太工程师，为Orlando飞机公司工作。
This country is famous for its beautiful lakes.
这个国家以其美丽的湖泊而闻名于世。
OK. Could you take it to the classroom?
好，那你能搬到教室里吗？