* When ice changes into water; it does not expand. Instead, it becomes smaller in volume.

冰变成水时并不膨胀，相反，体积变小了。

3. 译为汉语的并列分句

介词短语作状语表示转折或因果关系时，有时可以根据上下文转译为并列分句。如:

* The low-pressure compressor has four stages of compression against the eight stages of the high pressure compressor. 

低压压缩机有4个压缩阶段，而高压压缩机有8个压缩阶段。

* In a generator mechanical power is put in and electrical power is taken out, instead of electrical power going in and mechanical power coming out as in a motor.

在发电机中是输入机械能、输出电能，而在电动机中则是输入电能、输出机械能。

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