=piano hinge

continuous hinge的用法和样例：

例句

But the bending moment at the central hinge must vanish.但在中间铰处，弯矩必定为零。
The 2 main hinge parts have a central guide to prevent door sagging during adjusment.门铰两个主体有一个中心导槽，用于防止调整时门下垂。

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