问一个英语句子,patents in fields where innovation moves fast and is

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问一个英语句子,
patents in fields where innovation moves fast and is relatively cheap,这里and为什么和is连用,怎么翻译,这里的and

原句是这样的吧.分析一下它的结构.First,patents in fields【 where innovation moves fast and is relatively cheap】—like computing—should have shorter terms than those in areas where it is slowerand more expensive—like pharmaceuticals.
where引导的状语从句.首先从句也是一个句子,句子有且只有一个谓语动词.如果有连接词,比如and,那么可以有两个谓语动词.ininnovation moves fast and is relatively cheap创新速度快和相对廉价这个句子里,move是动词,and后面也需要一个动词,即is 这个be 动词.并且与后面的cheap形容词来连用.这里的and的意思就是“和”,表并列.

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