Envelops
n. 包络线；信封（envelop的复数）
🗣️ 情景例句
Is it all right if I use my credit card?
如果我使用信用卡行吗？
Better safe than sorry.
小心不出大错。
At the moment, he's reading an interesting book.
此刻，他正在看一本有趣的书。