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（4）状语 （其逻辑主语一般就是句子的主语）
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A. 在主语前（用“试探法”来确定其确切的含义，以“原因”和“对主语或后面句子的补充说明”为多见）
Accurate(精确的) in operation(运算) and high in speed, computers can save man a lot of time and labor(劳力). Free from(不受) the attack(侵蚀) of moisture(潮湿), a piece of iron(铁块) will not rust(生锈) very fast. Large or small, all circuits(电路) contain(包含) the same kinds of components(原件).
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Contrary(相反的) to common(普通的) belief(信念), forces(力) are not transmitted(传递) only by “direct contact”(直接接触). 为了学习下次课上的一个句子作准备，讨论一下“but”和“expose/exposure”的常见含义： Air is not visible(可见的), but it is matter(物质). An element(元素) is made up of(由…构成) but one kind of material. We cannot discover(发现) any material(物质) in an element but itself.
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This roll of film(胶卷) has been exposed(暴露) to light.
This book should be useful in exposing computer scientists to the latest(最新的) technology(技术). Excessive(过度的) exposure to X-rays is harmful(有害的) to one’s health(健康). Prior(先前的) exposure to advanced(高等的) mathematics is required(要求).
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