在内部作成圆形凸肩以代替锐缘孔板状的侧面。
It has rounded shoulders inside instead of the sharp orifice - like edge.
法兰盘只是一个统称，通常是指在一个类似盘状的金属体色的周边开上几个固定用的孔用于连接其它东西。
Flange is a general term usually refers to the metal in a similar color discoid open on the periphery of several fixing holes for connecting other things.
门上没有把手，也没有钥匙孔，只有一块上了年头的光光的木板，上面有个鹰状的青铜门环。
There was no handle and no keyhole: nothing but a plain expanse of aged wood, and a bronze knocker in the shape of an eagle.
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