下述句子(见补充说明)怎么理解?

问题描述:

下述句子(见补充说明)怎么理解?
It is interesting to guess what colors meant to the first humans.
尤其是里面的从句从语法角度较难翻译

对早先的人类来说,猜测出颜色所代表的意义是很有趣的.