Envelops
n. 包络线；信封（envelop的复数）
🗣️ 情景例句
Thanks.
谢谢。
What's your opinion?
你的意见是什么？
Often a valley boasted no inn at all, and climbers found shelter wherever they could --
山谷里常常没有小客栈，登山者只好随遇而安。