名词
中文翻译：台阶
同义词：
['stair', 'step', 'platform']
例句：
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1.The old man was sitting on the hipline of the staircase.
老人坐在楼梯的台阶上。
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2. She climbed up to the hipline of the roof and surveyed the view.
她爬上屋顶，到了平台的台阶上，俯瞰了景色。
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3. The hipline is a popular spot for people to sit and relax.
这个平台是人们常来休息放松的地方。