上台阶的英文：
navigate the stair

参考例句：

That is the only way to seize opportunities to push the economy to a higher stage.
坚持改革开放才能抓住时机上台阶。

navigate是什么意思：
v. 驾驶，航行（于）；使通过，小心翼翼地绕过；驾驭

Navigation between tools and menus
在工具和菜单之间导航

Columbus was a famous navigator.
哥伦布是个有名的航海家。

She has trouble navigating the stair.
她上下台阶有困难。

Inflect the interface for typical navigation.
为常见的导航调整界面。

The man is a sixteenth Spanish navigator.
那个人是十六世纪西班牙的航海家。

stair是什么意思：
n. 楼梯，阶梯

She has trouble navigating the stair.
她上下台阶有困难。

They went clumping up the stairs.
他们拖着沉重的脚步走上楼。

She pegged down the stairs.
她急忙下楼。

There was a woman mopping the stairs.
一个女人在拖楼梯。

She was standing at the top of the stairs.
她站在楼梯的顶端。