계단

계단

Stairs; staircase.

Here, '계단' is used to refer to the physical stairs one is walking down.

계단을 조심히 내려가세요.

Please walk down the stairs carefully.

In this sentence, '계단' describes the steepness of a specific set of stairs as a feature.

저 건물의 계단은 매우 높아요.

The stairs in that building are very steep.

Here, '계단' serves as the location where the action occurred.

그는 계단에서 미끄러져 넘어졌어요.

He slipped and fell on the stairs.