名词
中文翻译：Unknown
同义词：
['unhealthy', 'undesirable', 'dangerous', 'deadly']
例句：
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1. The air quality in this area is very unhealthy due to the high levels of pollution.
由于高污染水平，该地区的空气质量非常不健康。
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2. She was undesirable for her behavior at the party.
她因为派对上的行为而不受欢迎。
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3. The hike was dangerous due to the steep slope and lack of proper gear.
这次徒步旅行很危险，因为坡度陡峭且没有合适的装备。