座椅构件可以面向前方或面向后方架设在底部构件上。

The seat member can be provided on the bottom member in front or rear direction.

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在自顶向下的开发过程中，客户端和服务器端的开发人员使用WSDL(“顶部”)为各自的环境生成必要的构件(“底部”)。

In top-down development, both client-side and server-side developers use WSDL (the top) to produce the artifacts (the bottom) necessary for their respective environments.

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地板：刚性的建筑构件，将空间水平划分成楼层。地板构成房间的底部。

Floor: Rigid Building assembly that divides space horizontally into stories. It forms the bottom of a room.

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