里德教授观察发现，具有传染性的是老蚊子而不是幼虫。
Dr Read started from the observation that it is old, rather than young, mosquitoes that are infectious.
乙型肝炎病毒是影响卫生工作者的具有传染性的一大职业危害。
HBV is a major infectious occupational hazard of health workers.
一些研究者们已经试图去准确地定位这个具有传染性的心理现象机制。
A few researchers have tried to pinpoint the mechanism of contagious psychological phenomena.
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