as.substitute forwashing food down with water as a substitute for chewing is not a good idea.as 意为像,觉得和这里不配,substitute for 是一个短语,为什么前面有冠词a?

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as.substitute for
washing food down with water as a substitute for chewing is not a good idea.
as 意为像,觉得和这里不配,substitute for 是一个短语,为什么前面有冠词a?

这里的substitute是名词了,不和for组成短语了.
用水吞咽食物来代替咀嚼不是一个号方法.

as 这里不是像的意思,是“作为……”
as a substitute for 作为……替代,substitute 替代品,名词,签名当然要加 a
句意:喝水将食物冲下而替代咀嚼并不是好办法。