便于触摸和清洁铰链、斜壁的顶部。
这实木盒采用了顶部的铰链在拉丝金属盘。
This solid wood box features a brushed metal disk on top where the hinge is.
这是一个典型的控制问题，此中一辆汽车试图保持极安装在其顶部由一个铰链垂直移动来回。
This is a classic control problem, in which a vehicle tries to keep a pole mounted on its top by a hinge upright by moving back and forth.
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