Polyolefine
[化] 聚烯烃
🗣️ 情景例句
Affectionately, Uncle John.
爱你的，约翰叔叔。
Can you guess what I was doing this morning?
你能猜到今天上午我在做什么吗？
You must weigh it carefully.
你必须仔细地称一称重量。