doing,while+sb+be +doing的区别于联系
4个回答

两个while都是连词,while doing等于"during the time that or when",译为“在...期间,当...的时候”,当然这个时候的while doing也可改成while sb be doing ;而while sb be doing 等于“at the same time as”译为“与...的同时”或“一边...一边...”