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People living in closed,isolated communities.Try to explain

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People living in closed,isolated communities.Try to explain this phenomenon
such as Arctic explorers,often get a cold or two at first and then have several months free from colds.However,when the supply ship arrives the colds start again.
(explain this phenomenon,not translate the sentence)
People living in closed,isolated communities.Try to explain
居住在这个封闭的,与世隔绝的地区的人们,试图去解释这个现象:
比如北极圈的探险这,最开始会遭遇一两个月的寒冷天气,接下来的几个月又恢复温暖,然后,当运送供给的船只到达时,寒冷的天气又开始了