我探身向前朝院子里张望着，以为它落在一阶楼梯上。
I leaned over to look for it in the courtyard and thought I saw it just there on a step.
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.
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.
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