老实说，他已经有一段时间没有打球了。

To be honest, he has not played for a while now．

youdao

已经有一段时间了，不是吗？

For quite some time already, hasn't it?

youdao

他运气不佳！他运气不好，已经有一段时间了。

He had no luck! He had no luck and it'd been some time.

youdao

But, you can see that he was thinking about this structure for all along.

但我们可以想象得到,他对这个结构的思考已经有很长一段时间了。

麻省理工公开课 - 固态化学导论课程节选