很多人都有过这样的体验:爬山爬到一定的时候,会感到筋疲力尽,再也不想往上爬一步,但此时只要咬紧牙关坚持下去,不久就会感到全身舒坦,爬山的乐趣油然而生;跑步跑到一定的时候,也会感到筋疲力尽,但此时只要咬紧牙关坚持下去,不久就会感到呼吸舒畅,继续跑下去的勇气就会转变成一种轻松向前的惯性,两条腿也听使唤了.不管是爬山还是跑步,在你咬紧牙关的那一刻,就是你做一件事情的临界点. Many people have experienced this: When climbing a certain mountain, they will feel exhausted. They do not want to climb one step any longer, but at this time, as long as they clench their teeth, they will feel comfortable and the fun of climbing will soon be felt. When you run for a certain time, you will feel exhausted, but at this time, if you hold on to your teeth, you will soon feel comfortable breathing, and the courage to continue running will turn into a kind of easy forward inertia. He also listened to the call. Whether it is climbing or running, the moment you bite your teeth is the critical point for you to do something.