**Disclaimer:** I am not asking about **reduplication** nor **separable verbs**!

I have noticed that the Chinese often use the same verb twice as if deconstructing a sentence into smaller clauses. I have also noticed it's often optional. I am talking about such cases:

我可以**骑**自行车每天**骑**100km。

我已经**写**博士论文**写了**一整天。

I have never seen a similar property in any other language I had come in contact with, and would like to learn more about it. How is this thing called?