形容词
中文翻译：Unknown
同义词：
['unstable', 'precarious', 'unsafe', 'risky']
例句：
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1. The bridgewas precarious and had to beinspected regularly.
这座桥很不稳定，需要定期检查。
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2. The climb was precarious and required careful planning.
这次攀爬很危险，需要仔细规划。
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3. The projectis precarious due to the lackof funding.
由于缺乏资金，这个项目很不稳定。