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the consumption of fish also declined,but much less signific

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the consumption of fish also declined,but much less significantly to just below 50 grams,so although it remained the least popular food,consumption levels were the most stable
请高人帮忙分析一下句子的逻辑关系,so although 是不是因果关系里又嵌套了让步关系
much 为什么可以修饰less significant,less已经是一个副词了啊
but much less significantly to just below 50 grams ,这个句子没有主语是怎么回事,
to just below 50 grams 是个什么用法
1、so 引导结果状语从句,其中包含了一个 although引导的让步状语从句,也就是你说的因果关系里又嵌套了让步关系.
2、much 是副词,可以修饰形容词或副词的比较级,在这里修饰less significant.
3、but much less significantly to just below 50 grams ,是插入语,起状语作用,不是句子,是短语,所以没有主语.
4、to just below 50 grams 当中的to是介词,表示到达某种程度.整个短语意思是“到达低于50克的程度”.