1·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。
—— 《柯林斯英汉双解大词典》
2·There was a big jump in the number of people who report voluntarily working part-time.
自愿从事兼职工作的人数增长了很多。
3·Her kids voluntarily pitch in with the garden work, and the family cooks together instead of eating out.
她的孩子们自愿帮忙做园艺工作，全家一起做饭而不是外出就餐。
4·Two of the children always remained for the sermon voluntarily, and the other always remained too--for stronger reasons.
其中两个孩子总是自愿留下来听牧师讲道，另一个也总是留下来——因为更重要的原因。
5·Ten or twenty years ago, you could buy milk in returnable, refillable glass bottles, and many people recycled voluntarily.
十几二十年前，你买到的牛奶会装在可回收、可重复灌装的玻璃瓶里，许多人也自愿做回收工作。