Alternating current is usually supplied to people’s houses at 50 cycles per second.Р一般将来时? 表示将来发生的行为或情况。? In time, many things now unknown will e known.?现在完成时? 表示到现在为止发生的行为或者已经发生但对现在有影响的行为。? Cast iron is more brittle than iron which has been heated but not melted, but it is easier to shape, as it can be poured into moulds.Р二. 被动语态Р科技文章大多重在描写行为或状态本身,行为或状态的主体并不重要。?便于向后扩展句子,而不至于使句子显得头重脚轻。通常置于句首,突出其重要性。? In the puter the numbers to be manipulated are represented by sequences of digits which are first recorded in suitable code, then converted into positive and negative electrical impulses, and stored in electrical or ic registers.Р三.名词化Р名词化就是把动词变成有动作意义的名词。如果是动词短语或者是句子,则把这个动词短语或句子变成名词短语。? air moves air是motion的行为主体? the motion of air ? to apply force force是application的宾语? the application of force
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