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

一切物質(zhì)，不論是固態(tài)、氣態(tài)還是液態(tài)都是由極其微小的叫做分子的粒子所構(gòu)成的。

4. 當(dāng)or連接句子時(shí)，可譯為“否則”，有時(shí)or后會(huì)出現(xiàn)else。如：

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

必須給可控硅整流器充分的換流時(shí)間，否則會(huì)發(fā)生換流失敗。?

* 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.

各匝導(dǎo)線必須相互絕緣并與鐵芯絕緣，否則電流將短路，而不是圍繞線圈流動(dòng)。

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

溫度不能超過(guò)650°C，否則，此金屬會(huì)熔化。

5. 當(dāng)or連接數(shù)字，表示不確定的數(shù)字概念時(shí)，可譯為“大約”、“左右”等。如：

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

這些粒子大約需要ー兩天的時(shí)間才能到達(dá)地球。

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

據(jù)說(shuō)類(lèi)脂物A只含有大約40% — 50%的脂肪酸。

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