用普通的合页门，只是依靠合页的咬合力量也禁不住时间的考验，可以考虑采用地簧，门无论向里还是向外，都可以开合自如。
Use an ordinary hinge door hinge only rely on the bite force 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.
1986年，来自佛罗里达州湖城的理查德·霍夫曼，曾经测量到长达两秒钟时间，力量达到975磅(442公斤)的咬合力，创造了世界吉尼斯记录。
In 1986, Richard Hofmann of Lake City, Fla., achieved a bite strength of 975 pounds (442 kilograms) for two seconds, setting a Guinness Record.
1986年，来自佛罗里达州湖城的理查德·霍夫曼，曾经测量到长达两秒钟时间，力量达到975磅(442公斤)的咬合力，创造了世界吉尼斯记录。
In 1986, Richard Hofmann of Lake City, Fla., achieved a bite strength of 975 pounds (442 kilograms) for two seconds, setting a Guinness Record.
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