versions for some sentences in Chapter 5第五章

第五章减译（Omission）

10) *Different metals differ in their conductivity.

*不同的金属具有不同的导电性。

11) *The use of silver as a conductor is very limited because of its cost.

*由于成本高，很少用银作导体。

14) *The volume of the sun is about 1,300,000 times that of the earth.

*太阳的体积约为地球的130万倍。

17) *For every action there is an equal and opposite reaction.

对于每一个作用，都有一个大小相等、方向相反的反作用。

19) *The average speed of all molecules remains the same as long as the temperature is constant.

*温度不变，分子的总平均速度也不变。

20) *Practically all substances expand when heated and contract when cooled.

*几乎所有的物质都热胀冷缩。

25) *When the pressure gets low, the boiling-point becomes low.

*气压低，沸点就低。

26) *The result of the experiment is rather good.

*实验结果相当好。

28) *Copper wire allows a large current to flow than does iron wire.

*铜导线比铁导线通过的电流大。

29) *The molecules in gases move more freely than do those of liquids and solids.

*气体分子的运动比液体和固体分子更自由。

31) *Obviously, since this radiation is invisible, it is of no use to us for illumination purposes.

*很明显，由于这种辐射是不可见的，所以不能用于照明。

38) *From Florence the river Arno ran down to Pisa, and then it reached the sea.

阿诺河从佛罗伦萨流经比萨入海。

40) *They float on the surface of the water and they give off light when they are disturbed.

它们在水面上漂浮，受到干扰时便放出光来。