adj.不锈的,不会脏的,无污点的,未被玷污的
Terry was sitting on the bottom stair.
特里正坐在最下面的一级楼梯上。
The stair treads were covered with rubber to prevent slipping.
楼梯踏板上覆盖着橡胶以防滑.
I followed her down the stair.
我跟着她下了楼梯。