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Can verbs be used together in Chinese, for example, do people who are exposed to occupational risk factors have speech disorders?

Can be used together. However, if you only want to describe people who work on risk factors, you should not use them together. Contact or participate in it.

People engaged in dangerous occupations ...

Persons engaged in dangerous occupations ...

Personnel engaged in hazardous factor operations ...

Personnel exposed to risk factors ...

Contact with personnel engaged in hazardous factor operations