形容词
中文翻译：Unknown
同义词：
['unmarried', 'unwed', 'single', 'single-person', 'unmarried-person']
例句：
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1. The couple is nonmarriageable due to their age difference.
这对夫妇因为年龄差距而无法结婚。
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2. She is an unmarried woman who has been living alone for many years.
她是一个未婚女性，已经独自生活了很多年。
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3. Single parenthood is a common phenomenon in today's society.
单亲家庭在当今社会中是一种常见的现象。