前期研究显示艾滋病毒是在喀麦隆东南部由黑猩猩传播给人类的。
Previous studies have shown that HIV spread from chimpanzees to humans in southeastern Cameroon.
她说，前期研究显示，妊娠期增重过高的妇女生育超重婴儿的几率更大，这些婴儿今后也更有可能超重或肥胖。
Previous research has shown that women who pack on too many pounds during pregnancy increase their chances of having high birth-weight babies who become overweight or obese later in life, she says.
他自己在希腊人群中进行的前期研究给出了微弱的证据支持午睡设想，但是另外一个在哥斯达黎加人中进行的大型研究没有显示两者有联系。
His own earlier research in a Greek population provided weak evidence in favor of the nap hypothesis, but another, larger study, conducted in Costa Rica failed to show an association.
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