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　　"男性不需要如此的谨慎，他们有许许多多的精子，他们可以和许多女性生育后代。而一旦女性怀孕，她们需要经历9个月的忍耐。"

　　纳普博士说，有证据表明，体味同时也会发出一个人基因组成的信号。她强调，人类白细胞抗原基因就与免疫功能相关。

　　她表示，从进化的角度来说，女性若能和与自己基因组合不同的男性结合是很好的选择，因为那样他们的下一代很可能更健康。

　　句型讲解：

　　1. Researchers found it was difficult to mask underarm odour when a woman was doing the smelling, but quite easy to do so when it was a man.

　　本句是一个复合句。 found后面是省略了引导词的宾语从句，作found的宾语。其中it是形式主语，真正的主语是后面的不定式短语to mask underarm odour。后面两个when分别引导两个时间状语从句。

　　语法重点：宾语从句，时间状语从句

　　2. Dr Leslie Knapp, an expert in biological anthropology at the University of Cambridge, said there were good evolutionary reasons why a woman's ability to detect body odours should be more acute could literally be an effective way to sniff out a suitable mate.

　　本句是一个复合句。 an expert...Cambridge是Dr Leslie Knapp的同位语。 Said后面是省略了引导词的宾语从句，充当said的宾语。其中why引导限制性定语从句，修饰reasongs。 as引导原因状语从句

　　语法重点：同位语，宾语从句，定语从句，原因状语从句

　　3. She said in evolutionary terms it was desirable for a women to mate with a man whose genes were different from hers, as this was likely to produce more robust offspring.

　　本句是一个复合句，said后面是省略了引导词的宾语从句，充当said的宾语。其中it是形式主语，真正的主语是后面的不定式短语to mate with a man. whose引导定语从句，修饰man. as引导原因状语从句。

　　语法重点：宾语从句，形式主语，定语从句，原因状语从句