名词
中文翻译：单胎妊娠
同义词：
['monozygotic pregnancy', 'twin pregnancy', 'singleton gestation']
例句：
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1. She was diagnosed with a singleton pregnancy at the age of 25.
她在25岁时被诊断出单胎妊娠。
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2. The doctors were surprised to find out that she had a singleton pregnancy.
医生们惊讶地发现她怀的是单胎妊娠。
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3.Singleton pregnancies are rare but can still occur in women who have never been pregnant before.
单胎妊娠虽然罕见，但仍然可能发生在从未怀孕过的女性身上。