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。

责任编辑： admin