级台阶 The Thirty-nine Steps ; Thirteen Steps Down

踏进有百级台阶的大楼 Buildings with a hundred floors

级台阶段 stage

合唱团四级台阶 four-step choir riser

坐在最高的一级台阶上 sit on the top step

三十九级台阶. the.thirty-nine.steps

三十九级台阶 The Thirty-nine Steps

十一级台阶/当兵的人 Eleven steps / soldier

一蹦四级台阶地下楼梯 come down the stairs four at a time