Most people do not routinely lie about these things, except for age of first sexual encounter.

　　如果不是第一次性行为，一般情况下大多数人不会对这三个问题有所隐瞒。

　　The researchers took account of that by showing that claims as much as a year at variancewith the truth would make little difference to the outcome.

　　研究者们考虑到了这一点，指出对事实的陈述的差异如果在一年之内对结果无太大影响。

　　Dr Bellan plugged the results into a mathematical model that also takes account of HIV sprevalence in a country and how long people there live once they have been infected.

　　依据艾滋病在一个国家的传播程度和染病后人们的寿命时长，贝兰博士利用数学模型将其展现出来。

　　This let him estimate what proportion of HIV infections had come about by one or othermember of a couple having been unfaithful, as opposed to having been infected before thecouple got together, or having caught the virus from a partner so infected.

　　这样他就可以在相较于二人结婚之前一方染病或者结婚之后携带病毒的一方传染另一方的情况下，估算出由于无论是由于男方还是女方对婚姻不忠而导致感染艾滋病的比例。

　　The answer was between 27% and 61% for men and between 21% and 51% for women.

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