她一步迈四阶楼梯，把自己锁在她的房间里了。

She took the stairs four at a time and locked herself up in her room.

youdao

如果一阶楼梯的高度缩短到两毫米，大部分人将走楼梯。

If the height of a single step is off by as little as two millimeters.

youdao

如果一阶楼梯的高度缩短到两毫米，大部分人将走楼梯。

If the height of a single step is off by as little as two millimeters.

youdao