Tình nguyện là những hoạt động góp phần sức lực, kiến thức, kỹ năng để giúp đỡ những người xung quanh, thường là kém may mắn hơn mình, mà không cần đổi lại lợi ích tài chính, vật chất.
Volunteering is an activity that contributes energy, knowledge, and skills to help people around you, often less fortunate than yourself, without needing financial or material benefits in return.
Volunteer service is an activity that helps to provide strength, knowledge, and skills to help those around you, usually more unfortunate than oneself, without the need for economic or material benefits.
Volunteers are activities that help the energy, knowledge and skills of people around them, and are usually less fortunate than themselves without exchanging money or material benefits.