单词：superfecundation
[医] 同期复孕(指卵)
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barren, ['brən] adj 不育的，贫瘠的（缺少有益的植被），不结果实的＝sterile＝bare＝effete＝impotent＝infecund 【例】The desert is barren land 沙漠是贫瘠的土地。 【记】1）bar＝bare光光的－一无所有的－
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