Obviously, we know there is a baby coming; but other than that, we sign on for voluntary participation in an unfolding live mystery. (birthwithoutfearblog.com)
In a utility - sponsored model, the community solar project is owned or operated by a utility company, who opens it up to voluntary participation by their customers. (blog.aurorasolar.com)
To conduct a clinical trial, researchers require voluntary participation of thousands of people. (herpes2dating.com)