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1.数值大与小的比较
在同时期比较两个事物的数值时，例如，表达A大B小，常常用表示对比的连词while将两句话连接起来，并且在while后面的B事物前加上much more或者much less一类的比较级，以突出B的小，跟A做对比。例如：
Lamb and chicken were eaten in similar quantities (around150grams), while much less fish was consumed (justover50grams).
或者B事物前加用only来表示数值很小，又例如：
…nuclear power,..., had developed into the main source, producing almost 75% of electricity, at 126 units, while coal and oil together produced only 50 units.
变化幅度的大小也能够被类似的句式表达，比如：
The consumption of fish also declined, but much less significantly to just below 50 grams,
2.增长与减少的比较
这也是段落内部十分常见的对比方式。先描述A下降或上升了，然后用while或者类似的连词连接后面的B上升或下降了;同时，这种比较也适用于段落之间，比如正文的一个主体段写A,B和C都上升了，下一个主体段写D下降了。需要注意的是，如果是段落间的比较，则不适合用while，而应该用In contrast, Conversely, on the other hand一类表示意群对比的句首词。例如：
The consumption of chicken, on the other hand, showed an upward trend,…
(剑七Test2，作为一段的首句，说明前面一段写的是其他几种肉类的消费量都下降了。)
段落内部的比较还是可以放心大胆的用while,例如：
However, while the figures for the Western countries grew to about 15% in around 1990, the figure for Japan dippedtoonly 2.5% for much of this period,….
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句子构成的成分共分为九种：主语，谓语，宾语，表语，定语，状语，补语，同位语和插入语。
一、主语：句子的核心主体，通常位于谓语动词之前，表明一个句子是谁或何种情况所发出执行或是承受的。在写作中常做主语的有名词、代词、主语从句、V-ing、To do五种。
1名词：Computersare now being widely used in almost all fields.
2代词：Weare now living in an information-explosion era.
3主语从句：Whether sports stars should earn a high salaryis still discussed heatedly.
4V-ing:Surfing the Internetoffers a new way for people to relax themselves.
5To do:To protect the environmentis everybody’s business.
二、谓语：描述或阐述主语的情况，由动词来充当，常位于主语之后。
1表状态用系动词：As I see it, movie stars’earning a high salaryisunfair and unjustified.
2表动作用及物或不及物动词：The Internethas revolutionizedpeople’s way of life. Tastediffers.
3表拥有：人或物时用：have has无生命的东西：there be
Peoplehavedifferent views on this question.
There isno absolute agreement on this question.
4情态动词+动词原形：
In this way, teacherscan never be replacedby computers.
三、宾语：及物动词或介词所指向的对象。在写作中常做宾语的有名词、宾语从句、复合结构、V-ing、To do五种。
1名词作宾语：International tourism promotesthe economic development.
2宾语从句作宾语：Some people holdthat air travel should be restricted.
3复合结构：The advanced medical technology has madeit possible for people to live longer than ever possible before.
4 V-ing: Nobody can avoidbeing inf...
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