voluntary movement

例句：

1. 1. The volunteer group is responsible forcleaning the streets after the storm.
   志愿者小组在暴风雨后负责清理街道。
2. 2. He decidedto volunteer his time to help those inneed.
   他决定无偿地帮助那些需要帮助的人。
3. 3. The voluntary donation willgo towards funding a new library.
   这个自愿捐赠将用于资助一个新的图书馆。