Cách sử dụng
The word 'voluntary' means something that is not compulsory or mandatory, but rather done out of one's own free will or choice. For example, if you volunteer to help clean up the park, it is a voluntary act because you are not being forced to do it. It can also refer to an organization or program that is run by volunteers and not paid staff, such as a voluntary charity. In general, the word 'voluntary' implies that something is done willingly and without obligation.