短语
中文翻译：Unknown
同义词：
['on edge', 'on the brink', 'at risk']
例句：
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1. The climber was on the ropes when a sudden gust of wind caught him.
攀岩者在悬崖边缘时，一阵突如其来的风将他吹倒。
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2. He was on the brink of success but lost his nerve and gave up.
他即将成功，但失去了勇气，放弃了。
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3. She was on the brink of tears when her mother arrived.
她快要哭出来了，当她妈妈来了。