志愿者们投入了大量业余时间帮助无家可归的人的翻译：Volunteers put a lot of spare time to help homeless people 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

Volunteers put a lot of spare time to help homeless people

The volunteers invested the massive spare times to help the homeless person

Volunteers who had invested a great deal to help homeless people who spend their free time

Volunteers put a lot of spare time to help homeless people