These diseases have severe, perhaps even death. The factory should pay attention to the wastewater treatment system in order to maintain the health of workers as well.
These diseases have fatal effects may include death. Therefore, the factory should pay attention to the waste water treatment system in order to maintain the health of the workers, as well.
These diseases are the result of the death may be serious, so you should be careful to plant waste water treatment system in order to maintain good health, of the workers.