常用词语结构有：
like/unlike + NP 像…一样／与…不同
just as ．．． so．．．正像…一样 。
if．．． (then)．．．如果说…，那么…
... ， while / whereas / whilst ...而…(却)
the + adj. / adv. (比较级)， the + adj. / adv. (比较级)越…，就越…
as against ... 与…相比
(as)compared with ... 与…比较起来
as opposed to ... 与…相反
in comparison with ... 与…相比
by contrast 相反，对比起来
in contrast to / with ... 与…形成对照；与…完全不同
Light, like heat, is a form of radiation .
光，像热一样，是一种辐射形式。
This engine unlike / as opposed to the earlier one, has six cylinders．
这种发动机，与前一种不同，有 6 只汽缸。
Just as the sun is the central body of the solar system, so the nucleus is the core of the atom．
正像太阳是太阳系中的中心体一样，原子核是原于的核心。
At high speeds the turbo-jet is more efficient , while at low speeds the propeller is more efficient.
在高速时，涡轮喷气式飞机效率较高，而在低速时，螺旋桨飞机更有效。
Dark-colored objects absorb light， whereas light-colored objects reflect light．
深色的物体吸收光，而浅色的物体反射光。
The heavier the electric current， the stronger the electromagnetism．
电流越大，电磁性越强。
If the desert can be Called a sea， then the camels are the ships in it．
如果沙漠可以称为海洋，那么骆驼便是海洋中的船了。
In comparison with designers of propeller-driven aircraft， designers of jet aircraft have
greater freedom in deciding where to place their engines .
与螺旋桨飞机的设计师相比，喷气式飞机的设计师有更大的自由来决定安装发动机的位置。
The volume of liquids are not easily changed in contrast to their shapes , which readily alter．
液体的体积不容易改变，这完全不同于其形状，因为其形状很容易改变。
(参见 compare， comparison， contrast)
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