Polyolefin
n. [化]聚烯烃
🗣️ 情景例句
Don't worry about it. It's nothing.
别担心，没事儿。
What is the total circulation of this journal.
这份报刊总发行量多少？
He had his supper, listened to the radio, read a newspaper and then went to bed.
他吃晚餐，听收音机，读报纸，然后睡觉。