Yes they can, but it is strictly voluntary.
voluntary trade probably mean means to volunteer trade.
Voluntary muscles are those muscles that can be moved by the conscious effort and the will of an individual.
The word voluntary can mean doing or giving something out of free will. An example of a sentence using the word voluntary would be, many charities are run on voluntary time and donations.
well it depend what you mean i can kind of controll it voluntary or involintary i do it involuntary when riding but starting i do it voluntary for most people ints voluntary
A response that you can control
You didn't have to hide to get out of serving in the army in WW1 as service was strictly on a voluntary basis.
My crew, My Bros.
The United States armed forces are a voluntary force. You do not have to serve if you don't want too. if you are talking about ground forces the U.S. Navy does ask for volunteers. You can also be ordered to go as well.
The muscle that you move intentionally
It means "voluntary charity".
Argumentative. Applies strictly to females.