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VOA慢速英语:新研究将助孕妇足月分娩
2017-09-18来源:和谐英语
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womb – n. a woman’s uterus where a baby is formed
DNA – n. deoxyribonucleic acid -- a substance that carries genetic information in the cells of plants and animals
defect – n. a problem or fault that makes someone or something not perfect
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