voluntary dive with limit

例句：

1. 1.He decided to volunteer for the local charity event.
   他决定为当地的慈善活动做志愿者。
2. 2.The voluntary work helped improve the community's health.
   这种自愿工作有助于改善社区的健康。
3. 3. Many people choose to volunteer their time and skills to help others.
   许多人选择利用自己的时间和技能来帮助他人。