码头边板

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 楼梯梁

... 梁 beam 楼梯梁 bridge board; bridgeboard; stair stringer; stringpiece 槽钢楼梯梁 channel stringer ...

 楼梯基

... 楼梯段 flight 楼梯基 stair carriage; stringer; stringpiece 楼梯架 carriage ...

 横木

... 的 4次方是 The fourth power of 2 i ... 横木 stringpiece; transom; byatt 马车前端用以系曳绳的横木 whippletree ...