* Quantities which have both magnitude and direction are called vector quantities.
具有大小和方向的量稱(chēng)為矢量。
* The turret lathe is equipped with a turret for mounting a number of different cutting tools which are used in sequence,
六角車(chē)床有ー個(gè)六角刀架，用來(lái)安裝若干把按順序使用的不同的刀具。
介詞+which的定語(yǔ)從句大部分為限制性定語(yǔ)從句，翻譯時(shí)可將定語(yǔ)從句與主句合譯，也可將從句譯為“的”字結(jié)構(gòu)。如：
* That's the reason for which the expansion of liquid takes place on the surface only.
那就是為什么液體膨脹只發(fā)生在表面的原因。
* Heat is a form of energy into which all other forms are convertible.
熱是其他種類(lèi)的能都可以轉(zhuǎn)換成的一種能。
* No method is known by which it is possible to create energy out of nothing.
能夠憑空創(chuàng)造能量的方法是沒(méi)有的。
(2) 譯為并列分句，這時(shí)which可以譯為它所代替的先行詞，或譯為“該”,“它”“這（些）”等。如：
* Laser light is coherent, which means that the outer edges of the beam are almost perfectly parallel to each other.
激光的光是相干的，也就是說(shuō)，光束的外邊沿幾乎完全相互平行。
* 1 is the value of constant K, which does not change with any factors.
1是常數(shù)K的數(shù)值，它不隨任何因素的變化而變化。
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