* All matter, solid, gaseous or liquid, is made up of extremely tiny particles called molecules.

一切物质，不论是固态、气态还是液态都是由极其微小的叫做分子的粒子所构成的。

4. 当or连接句子时，可译为“否则”，有时or后会出现else。如：

* Sufficient commutation time must be allowed for the thyristors, or commutation failure will occur.

必须给可控硅整流器充分的换流时间，否则会发生换流失败。 

* The turns of wire must be insulated from each other and from the iron, or the current will flow through short-circuits instead of flowing around the coil.

各匝导线必须相互绝缘并与铁芯绝缘，否则电流将短路，而不是围绕线圈流动。

* The temperature must not exceed 650°C, or else the metal will melt.

温度不能超过650°C，否则，此金属会熔化。

5. 当or连接数字，表示不确定的数字概念时，可译为“大约”、“左右”等。如：

* The particles require one or two days to reach the earth.

这些粒子大约需要ー两天的时间才能到达地球。

* Lipoid A is reputed to contain only 40% or 50% of fatty acids.

据说类脂物A只含有大约40% — 50%的脂肪酸。

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