noun · a series of steps or a flight of stairs, often at the entrance of a building

他坐在大门前的台阶上休息。

noun · a step-like landform or level terrace in geology, excavation, or mining

这个露天矿场的台阶设计非常科学。

noun · a figurative opportunity to extricate oneself from an embarrassing or awkward situation

既然他已经主动道歉了，你就顺着台阶下吧。