为什么用volunteer doctors而不用voluntary doctors?

There were many volunteer doctors here.________ ________ ___ () Many doctors and nurses volunteer ___ for ORBIS. 为什么志愿者工作用的是volunteer work而不是voluntary work? volunteer和voluntary two后面应该是用men doctors 还是 man doctors nobody but doctors or nurses and those invited为什么不用are invit 英语翻译 志愿工作者 是用 volunteer workers 还是voluntary workers women doctors还是woman doctors i have two brothers,both_are doctors.为啥不用BOTH OF THEM非要用BOTH 为什么woman doctor复数形式是women doctors 而girl student复数形式是girl stu volunteer与voluntary的区别 i have been finishing up my volunteer work for doctors witho