Because a full-forcebite could wind up hurting them.
因为全力一咬很可能以伤害他们自己而告终。
2
Who are not who lives easier. But some people said, hardly wished to live. And some people, quietly bite, force yourself to learn to strong.
谁都没有比谁生活的容易。只是有的人呼天抢地，痛不欲生。而有的人，却默默地咬牙，逼自己学会坚强。
3
Use an ordinary hinge door hinge only rely on the biteforce can not help the test of time, could be considered to spring, either to the inside or outside the door, you can open and close easily.