如何使用 "yawn" 造句

1. A yawn is more contagious than any of these .
打哈欠比任何这些状况都更易传染。
2. Err , don 't people yawn because they 're bored and / or tired ?
呃,人们打呵欠难道不是因为他们感到无聊或疲劳了吗?
3. But not everyone is susceptible to the yawn contagion .
但不是所有人都容易受到哈欠传染的影响。
4. In fact I can feel a yawn coming on now .
事实上我能感觉到现在有一个哈欠即将到来。
5. Excuse me while I stifle a yawn .
抱歉,我忍住了一个哈欠。