Envelops
n. 包络线；信封（envelop的复数）
🗣️ 情景例句
I'm just not sure about what I want to do.
我不知道该读什么？
The first element of success is the determination to succeed.
成功的首要因素是要有成功的决心。
Do you think we will find a solution for the problem?
你认为我们会解决这个问题吗？