if the height of a single step is off by as little as two millimeters
如果一个台阶的高度只差了两毫米
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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。
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If the height of a single step is off by as little as two millimeters, most people will trip.
如果有一格阶梯的高度存在哪怕两毫米的微小差距，大多数人被会被绊倒。
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