台湾籍旅美老师今天交给我们的句子是：

Both talking and breathing has a mortal enemy, and that enemy is laughter, because what happens when you laugh is those same muscles start to contract very regularly.
说话及呼吸这两者都有个致命的敌人，那个敌人就是笑，因为当你在笑的时候，同样的那群肌肉会开始非常规律地收缩。