he didn’t know much about the harmful effects on smoking,为什么用much,不用many

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hedidn’tknowmuchabouttheharmfuleffectsonsmoking,为什么用much,不用manyhedidn’tknowmuchabouttheharmfuleffect

he didn’t know much about the harmful effects on smoking,为什么用much,不用many
he didn’t know much about the harmful effects on smoking,为什么用much,不用many

he didn’t know much about the harmful effects on smoking,为什么用much,不用many
much 在这里用作不可数名词,充当 know 的宾语;
many 只是代词或形容词,不能在这里充当宾语;
句子意思 = 关于抽烟的不利影响,他原来知道的不是很多.