Polybutyrolactam
[化] 聚丁内酰胺; 尼龙-4
🗣️ 情景例句
He's on the phone.
他在电话上。
Slowly, stricter laws and regulations are being passed by Congress.
慢慢地，在国会表决通过了更严厉的法律法规。
May I help you?
我能帮忙吗？