Most people in the region become infected with HBV during childhood.
该地区大多数人在儿童时期即已感染乙型肝炎病毒。
By the end of the trial only 125 people had become infected with HIV.
到了试验结束时,只有125人感染了艾滋病毒。
For the sake of research, you actually volunteered to become infected with a cold.
为了研究的需要,其实你是自愿感染了感冒。
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