voluntarily
adv. 自动地；以自由意志
例句
I would never leave here voluntarily.
我永远不会自愿地离开这里。
《柯林斯英汉双解大词典》
He was not asked to leave—he went voluntarily.
没人让他走，是他主动走的。
《牛津词典》
Four people who sought refuge in the Italian embassy have left voluntarily.
到意大利大使馆寻求避难的四个人已经自愿离开了。
