voluntary

• 指行为或服务出于自愿，没有强迫或报酬。也指由自愿者组成的、有意的或自发的。

Describes an action or service that is done willingly, without being forced or paid.

1. Done by choiceB1formal

   Done, given, or acting of one's own free will, without being forced or paid.

   自愿的

   • She does voluntary work at the local hospital.
   • The donation is completely voluntary.
   • He made a voluntary decision to leave the company.

   同义词deliberatediscretionaryelectiveintentionaloptionalspontaneousuncoercedunforcedwilling

   反义词compulsoryforcedinvoluntarymandatoryobligatory

2. Not mandatoryB1formal

   Not required by law or rule; optional.

   自愿的

   • Attendance at the seminar is voluntary.
   • The program offers voluntary health screenings.
   • Participation in the survey is strictly voluntary.

   同义词discretionaryelectiveoptional

   反义词compulsoryforcedmandatoryobligatoryrequired

• 名词，指自愿、无偿地进行的行动或服务，不受强迫或报酬驱动，常用于慈善或公共事务语境。

A noun referring to an action or service performed willingly and without compulsion or payment, often in the context of charitable or community work.

1. Organ pieceC1formalbritish

   A solo piece of music played on an organ, often during a church service.

   管风琴独奏曲

   • The organist played a beautiful voluntary after the service.
   • The wedding began with a voluntary by Bach.
   • The church choir performed a voluntary during the ceremony.