Is a ‘selfish gene’ making a Utah family have twice as many boys as girls?

· · 来源:api资讯

Author(s): Oliver A. Dicks, Solveig S. Aamlid, Alannah M. Hallas, Joerg Rottler

Фото: Кирилл Зыков / РИА Новости

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不知道从什么时候开始,“变工”这个词就从我的记忆里淡了。某种程度是因为时代变迁,一些亲戚举家搬离窑洞,住进山头的新农村基地或县城里的楼房,养牲畜的人家变少,土地经年累月荒废,种地的人没理由再叫不种地的人帮忙。花钱雇外地来的收割机,成了新潮流。