名词
中文翻译：台阶
同义词：
['stair', 'step', 'riser例句：1. The old manstepped down from his wheelchair to theground.（老人从轮椅上走下来到地上。）']
例句：
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1. The old manstepped down from his wheelchair to theground.
老人从轮椅上走下来到地上。
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2.The steps are steep and challenging.
这些楼梯陡峭且具有挑战性。
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3. The stairslead up to the secondfloor.
这些楼梯通往二楼。