90. The increase in the numbers of married women employed outside the home in the twentieth century had less to do with the mechanization of housework and an increase in leisure time for these women than it did with their own economic necessity and with high marriage rates that shrank the available pool of single women workers, previously, in many cases, the only women employers would hire. 二十世纪已婚妇女在家庭以外就业的人数不断增加,这与家务的机械化及这些妇女闲暇时间的增加并无多大联系,更多地是与妇女自身的经济需要和高婚姻率相关。高婚姻率致使所能雇佣的单身女工的总量缩减,而在此之前的许多情形中,单身女性则是雇主们所愿雇佣的唯一-一类妇女。 The pool of 如果后面跟着一群人,则表示劳动力资源。
91. For one thing, no population can be driven entirely by density-independent factors all the time. 请思考:如果文中说这句话的前提是:all population are driven by two categories of growth parameters, one is density-independent factors, and the other is density-independent factors. 那么作者说上面的这句话有什么用意。解释:本句虽然貌不惊人,但本书既然将其收录进来,并标出难度5,就意味着其中有怪异之处。值得一提的是,本文前面曾把控制种群密度的因素分为两种,一种叫做density-dependent factors,另一种叫做dentsity-independent factors。原文的直译虽然好懂,但是总令人感觉说得不甚明白。显然,GRE或GMAT的作者不可能随便说一句无关痛痒的话,那么没有任何种群能够在所有的时间全被d-I因素所控制,其真正意思是什么呢?就是:一切种群都必然在某个时间内受到d-d因素的控制。本句是ETS在考试中惯用的正话反说的典型例子,请读者深沉体会。本句在文章中也是理解作者态度的关键所在。
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