名词
中文翻译：台阶
同义词：
['stair', 'step', 'riser']
例句：
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1. The oldman stepped up to the podium andbegan his speech.
老人走上讲台开始演讲。
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2. The children were climbing the steps toreach the top of the tree.
孩子们正在爬楼梯到达树顶。
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3. Thenew building has a largeglass staircase leading upto the main entrance.
新建筑有一个大玻璃楼梯通向主入口。