状语从句(3).

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1 状语从句(3)

2 二、由“as”引导的状语从句 它可以表示以下几种含义： 1、表示时间 (1)译成“当…时候”(一般两动作同时发生) As the current flows(流动), energy from the battery(电池) goes to the resistance(电阻). (2)译成“随着”(从句中有表示变化的动词，change, vary, increase, decrease, rise, fall等)

3 As the usage(使用) of the Internet(英特网) increases, its scarcity(缺少) of built-in(内在的) security(安全措施) becomes more and more of a problem(问题). The force(力) of gravitational attraction(万有引力) between two bodies(物体) decreases as the distance between them increases. 2、表示原因(译成“因为，由于”，这只能从整句的逻辑含义上来判断) As air has weight(重量), it exerts(施加) force on any object(物体) immersed(浸沉) in it.

4 3、表示方式(译成“如同,像…一样;在as前往往有程度副词just, exactly, much, somewhat”)
Electrons(电子) move round the nucleus(原子核) just as the planets(行星) move round the sun. 4、表示同等比较(译成“如…”，它属于“as … as句型中的第二个as”) This machine works as well as that one (does). 5、表示让步(译成“虽然”，从句一部分必须倒装在as前，在科技文中主要是在从句中作表语的词)

5 Small as they are, atoms(原子) are made up of(由…构成) still(更) smaller units(单元).
复习题：英译汉(涉及as和while) 1. The positive(正的) charge(电荷) of the nucleus is of greatest importance(重要性) as it determines(决定) the chemical(化学的) nature(性质) of the atom. 2. An electron whirls(旋转) around the proton(质子) at a tremendous(极大地) speed—much as a ball on the end(末端) of a string(细绳) might be whirled around your head(头).

6 3. A metallic(金属) conductor(导体) becomes heated(发热) as the current flows through it.
4. A liquid(液体), while it adapts(使适合) its shape(形状) to that of the container(容器), has a definite(确定的) volume(容积). 5. While x can lie(处于) between -1 and +1, there are an infinite number of(无限个) values(值) of y for every value of x.