Horizontal ledge forming the base of a window.

• Interior or exterior surface used as a shelf.

窗户底部的水平边沿。

• 室内或室外的台面，常作搁放处。

Horizontal member forming the bottom of a doorway.

• The threshold you step over.

门洞底部的水平构件。

• 进出时脚下跨越的门槛。

Base plate of a wall or frame resting on a foundation.

• Horizontal member bearing the uprights.

架设在基础上的墙或框架的底部横梁。

• 承托立柱的水平构件。

Tabular igneous intrusion parallel to surrounding strata.

• A concordant sheet of cooled magma.

与围岩层理平行的板状岩床状侵入体。

• 与层面一致的冷却岩浆薄层。

Threshold across a lock chamber floor against which gates close.

• Protects the gates’ bottoms and seals water.

船闸底部横向门槛，闸门靠其关闭。

• 保护门底并起到止水密封作用。

Raised ridge at the base of the nasal aperture in the skull.

• Anatomical landmark in forensics and anthropology.

颅骨鼻孔下缘的隆起边缘。

• 法医学与人类学中的解剖标志。