1．常用 词语：
define … as … 把…定义为…
by … we mean … 所谓…是指…
be defined as … 被定义为…
by … is meant … 所谓…是指…
refer to … 是指…
Motion may be defined as a continuous change in position .
运动可被定义 为位置的不断变化。
Humidity refers to the amount of water vapour in the air .
湿度是指空 气中的水蒸气含量。
By conductivity we mean the ability to conduct an electric current .
所 谓电导率是指传导电流的能力。
By electrical resistance is meant the hindrance to the flow of electrons .
所谓电阻是指对电子流动的阻力。
2．常用表达式：
“A ” is a / an “B” + “C”
“A” is defined as a／ an “B” + “C”
式中, “A”是被定义的 词；
“B”是总类词；
“C”是定义限定词。
定义限定词常用以下的 几种表达方式：
which-定语从句
-ed 分词短语
-ing 分词短语
for + - ing
with + NP
介词 + which- 定语从句
A pump is a machine which is used for transferring a liquid or a gas from one place to another .
泵是将液体或气体从一处输送到另一处用的机 械。
Aluminium is a metal produced from bauxite .
铝是从铝土矿提炼出的一种金属。
Brass is an alloy containing a large proportion of copper .
黄铜是一种含有大部分是铜的合金 。
Tungsten is a metal with the property of remaining hardness at red heat .
钨是一种在赤 热状态下仍能保持坚硬性质的金属。
The micrometer is an instrument by means of which very accurate measurements can be made .
测微计是一种可用来进行精密测量的仪器。
A wheastone bridge is an apparatus for measuring the resistance of an electric circuit .
惠斯通电桥是 测量电路电阻用的一种装置。
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