It 's because of hard work-ten years of hard work.

那是因为艰苦的工作——十年艰苦的工作！

youdao

It 's hard for him to finish the work.

完成那项工作对他来说很难。

youdao

It 's hard for him to finish the work.

完成那项工作对他来说很难。

youdao