This proverb is based on an old English law dating back to the 17th century.
问题描述：
This proverb is based on an old English law dating back to the 17th century.
这里为什么用dating
我是问为什么用dating 而不是date
答
这条格言取材于17世纪一项古老的英国法律.我是问为什么用dating 而不是date动名词（分词）dating 词组作状语。如果用动词形式date，那么就需要以从句的形式出现。这句话也可以说成This proverb is based on an old English law which date back to the 17th century.