9) We have to oil the moving parts of the machine, the friction of which may be greatly reduced.

我们必须给机器的转动部件上油，以大幅度地减少摩擦。

(四）转换成让步状语从句

10) Electrons, which normally repel each other, seem to travel in pair at unusually cold temperature.

电子虽然在常态下互相排斥，但在极低的温度下似乎是成对地运动。

11) Friction, which is often considered as a trouble, is sometimes a help in the operation of machines.

摩擦力常被认为是一种麻烦，但有时却有助于机器的运转。

12) Photographs are taken of stars and other objects, the light of which is too faint to be seen by eyes at all.

虽然许多星球和其它天体的光线非常微弱，眼睛根本看不见，但它们的照片还是被拍下来了。

（五）转换成条件状语从句

13) Food which is kept too long decays because it is attacked by yeasts, moulds and bacteria.

食物如果存放过久，就会腐烂，为食物受到了酵母、霉菌和细菌的侵蚀。

14) Any parts of a plant which are found to have been discoloured or attacked by insects must not be used as medicinal herbs.

植物的任何部分，只要发现已经变色或已受虫蛀，就不得入药。

（六）转换成时间状语从句等

15) Electrical energy that is supplied to the motor may be converted into mechanical energy of motion.

电能一旦供入电动机，就转换成运动的机械能。(转换成时间从句）

16) For that, use is generally made of correction motors which in the present state of the technique are complicated, very expensive and often do not give complete satisfaction.

为此，一般要采用校正电机。但就目前技术水平而言，这种电机结构复杂、价格昂贵，而且往往不能令人十分满意。（从句译成含转折意义的独立句）

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