don't touch what we don't need.为什么用what啊!急用!

问题描述:

don't touch what we don't need.为什么用what啊!急用!
Don't touch what we don't need.在这个句子中为什么用what不用that啊,what在句中作什么成分啊?

这里的what是touch的逻辑宾语,所以不能换成that