马可尼构想的无线电是作为电话的替代品，一种私人交谈的工具。

Marconi's conception of the radio was as a substitute for the telephone, a tool for private conversation.

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但是如果一个国家或世界某个地区有过多的木质燃料，不妨把木材气体作为一种不错的替代品。

But for areas of the country or the world that have a surplus of woody type fuel, wood-gas offers a good alternative to petroleum.

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克拉匹多是一种新药，价格更贵，可用来作为对阿斯匹林过敏病人的替代品。

Clopidogrel is a newer, more expensive, alternative to aspirin which may be used in some patients intolerant of aspirin.

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