这句话的句子成分怎么划分啊.?The initial discovery by humans almost 10,000 year_英语解答

这句话的句子成分怎么划分啊.?
The initial discovery by humans almost 10,000 years ago that they could exploit metallic mineral deposits was an important milestone in the development civilization.

人气：452 ℃　时间：2019-10-30 01:46:22

解答

"The initial discovery "（是主语）by humans almost 10,000 years ago that they could exploit metallic mineral deposits was（是谓语） an important milestone（是宾语） in the development civilization.