自觉 (zì jué): to be aware, to act on one’s own; conscious

He voluntarily gets up at six every morning to go running, never needing an alarm clock to remind him.

After the teacher's patient guidance, Xiaoming finally voluntarily admitted his mistake and apologized to his deskmate.

Voluntarily queuing up in public places and not cutting in line is a basic quality that every citizen should have.

She felt that she was not feeling well, so she asked for leave in advance and went home to rest.

The classmates voluntarily formed a study group and discuss difficult problems together every Wednesday afternoon.