名词
中文翻译：三胞胎
同义词：
['triplets', 'singletons']
例句：
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1.The twins are triplets, but their mother is a singleton.
双胞胎是三胞胎，但他们的母亲是一个单胞胎。
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2. The baby boy is a singleton, but his sister is a triplet.
这个婴儿男孩是一个单胞胎，但他的妹妹是一个三胞胎。
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3.The researchers found that the singletons were more likely to survive than the triplet siblings.
研究人员发现，单胞胎比三胞胎兄弟姐妹更有可能生存下来。