ladder

/ˈlædər/

steps consisting of two parallel members connected by rungs; for climbing up or down

中文释义：梯子；阶梯

He climbed up the ladder to clean the gutters on the roof.

他爬上梯子清理屋顶的排水沟。

Education is often seen as a ladder to social mobility.

教育常被视为社会流动的阶梯。