急！中译英！在线等！

Volunteers on a voluntary basis to contribute their time and energy without taking into account the case of remuneration, in order to promote human development, improving social services, promote social progress and social welfare activities and the provision of services

"One's own time and energy that the volunteer contributes voluntarily, in case of not considering remuneration, serve for promoting the development of mankind, improving the society, promote the activity that social progress and social utility provide service. "