n. 梯级, 楼梯, 阶梯

[ noun ]
support consisting of a place to rest the foot while ascending or descending a stairway
<noun.artifact>
he paused on the bottom step

Stair \Stair\ (st[^a]r), n. [OE. steir, steyer, AS. st[=ae]ger,
from st[imac]gan to ascend, rise. [root]164. See {Sty} to
ascend.]
1. One step of a series for ascending or descending to a
different level; -- commonly applied to those within a
building.

2. A series of steps, as for passing from one story of a
house to another; -- commonly used in the plural; but
originally used in the singular only. ``I a winding stair
found.'' --Chaucer's Dream.

{Below stairs}, in the basement or lower part of a house,
where the servants are.

{Flight of stairs}, the stairs which make the whole ascent of
a story.

{Pair of stairs}, a set or flight of stairs. -- pair, in this
phrase, having its old meaning of a set. See {Pair}, n.,
1.

{Run of stairs} (Arch.), a single set of stairs, or section
of a stairway, from one platform to the next.

{Stair rod}, a rod, usually of metal, for holding a stair
carpet to its place.

{Up stairs}. See {Upstairs} in the Vocabulary.