Polybutyrolactam
[化] 聚丁内酰胺; 尼龙-4
🗣️ 情景例句
you've been writing for the school paper.
你为校刊写文章。
May I use your telephone?
我可以用你的电话吗？
I can't say for certain off-hand.
我还不能马上说定。