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五、常用句型
科技文章中經常使用若干特定的句型，從而形成科技文體區別于其他文體的標志。例如It---that---結構句型；被動態結構句型；結構句型，分詞短語結構句型，省略句結構句型等。舉例如下：
It is evident that a well lubricated bearing turns more easily than a dry one .
顯然，潤滑好的軸承，比不潤滑的軸承容易轉動。
It seems that these two branches of science are mutually dependent and interacting .
看來這兩個科學分支是相互依存，相互作用的。
It has been proved that induced voltage causes a current to flow in opposition to the force producing it.
已經證明，感應電壓使電流的方向與產生電流的磁場力方向相反。
It was not until the 19th century that heat was considered as a form of energy.
直到十九世紀人們才認識到熱是能量的一種形式。
Computers may be classified as analog and digital.
計算機可分為模擬計算機和數字計算機兩種。
The switching time of the new-type transistor is shortened three times .
新型晶體管的開關時間縮短了三分之二。（或---縮短為三分之一。）
This steel alloy is believed to be the best available here .
人們認為這種合金鋼是這里能提供的最好的合金鋼。
Electromagnetic waves travel at the same speed as light .
電磁波傳送的速度和光速相同。
Microcomputers are very small in size ,as is shown in Fig.5.
如圖5所示，微型計算機體積很小。
In water sound travels nearly five times as fast as in air .
聲音在水中的傳播速度幾乎是在空氣中傳播速度的五倍。
Compared with hydrogen, oxygen is nearly 16 times as heavy .
氧與氫比較，重量大約是它的十六倍。
The resistance being very high ,the current in the circuit was low.
由于電阻很大，電路中通過的電流就小。
Ice keeps the same temperature while melting .
冰在溶化時，其溫度保持不變。
An object, once in motion ,will keep on moving because of its inertia.
物體一旦運動，就會因慣性而持續運動。
All substances ,whether gaseous ,liquid or solid ,are made of atoms .
一切物質，不論是氣態、液態，還是固態，都由原子組成。
