Voluntary means you have voluntary control, while the involuntary you do not have voluntary control of them.
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voluntary informant
do voluntary job.
physical hazard,mechanical hazard,chemical hazard,electric shock hazard,crt monitor high voltage hazard.
I played a voluntary on the organ on Sunday. Your response to my request is entirely voluntary.
It is voluntary because your voluntary muscells in the arm are preforming this action.
Voluntary .. you make the choice to for example get a soda can .. blinking, breathing are involuntary you don't have to think about it
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Voluntary