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Density Independent Population Driven Factors N Time Thing 意群训练

en For one thing, no population can be driven entirely by density-independent factors all the time.
parts

意群训练: For one thingno populatio n can be drive n entirely by density-independent factor s all the time .

mark

标志: For one thing,no population can be driven /entirely by density-independent factors/ /all the time/.

cn

译文: 首先,没有任何种群 能够/在所有的时间内//完全地被d-i因素/所控制

tips 请思考:如果文中说这句话的前提是 all population are driven by two (and only two) categories of growth parameters,one is density-dependent factors,and the other is density-independent factors, 那么作者说上面的 no population can be driven entirely by density-independent factors all the time 的用意何在 ?
explain

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(这里简称d-d因素),另一种叫做density-independent factors(简称d-i因素)。

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内完全地被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,请读者深深体会。本句在文章中也是理解作者态度的关键所在。

type 正话反说
score 5
idx 090
category gre

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