这个句子 怎么改专业点

句子有误。
Work不可数名词，不能用many
In fact, there has been already much dangerous work , such as mining, which can be finished by robots.
Which做非限制性定语从句
already常用于完成时
such as ……做插入语

或
In fact, there is much dangerous work which can be finished by robots, such as mining.

In fact，robots can finish much dangerous work, such as mining

In fact， many dangerous work such as mining can be finished by robots

In fact， robots can finish many dangerous work such as mining