名词
中文翻译：边缘
同义词：
['edge', 'rim', 'step']
例句：
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1.The climber carefully placed his foot on the ledge to avoid falling.
攀岩者小心翼翼地将脚放在边缘上，以免掉下去。
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2. The cliff edge was treacherous and dangerous.
悬崖的边缘非常危险。
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3.She climbed up the rock face with care, testing each ledge before moving on.
她小心地沿着岩石表面攀登，每经过一个台缘都要测试一下再继续前进。