形容词
中文翻译：单一的
同义词：
['unique', 'singular例句：1. The single most important factor in the success of any project is teamwork.（任何项目成功最重要的因素是团队合作。）']
例句：
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1. The single most important factor in the success of any project is teamwork.
任何项目成功最重要的因素是团队合作。
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2.She has a single sister and two brothers.
她有一个姐姐和两个兄弟。
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3. He has only one friend in the whole world.
他全世界只有一个朋友。