英文: Why Do People Yawn?
中文: 为什么会打呵欠?英文: A cavernous yawn; cavernous echoes.
中文: 瓮音的呵欠;洞中的回声英文: It is also believed that watching someone else yawn will cause you to yawn too.
中文: 此外,人们还认为看到别人打哈欠,自己也会开始打哈欠。英文: His speech made me yawn.
中文: 他的演讲令我打哈欠。英文: His long boring story made me yawn.
中文: 他的冗长的故事听得我直打呵欠。