I've learned a lot that way.为什么省略了in?

I've learned a lot that way.为什么省略了in? I've learned a lot that way. I've learned a lot that way.a lot成分? I've learned a lot that way.通过那种方式我学到了很多. l 've learned a lot.that way?期中that前为什么不用with Yes.l have l ve learned a lot that way. 帮我分析一下这个句子的句子成分--------I 've learned a lot that way. learn a lot that way中是否省略了by或in,如by that way,in that way i have learned a lot that way.是什麽意思? I have learned a lot that way .这句话中为什么直接用that way ,而不用by tha I have learned a lot that way.这里that way需要加by么?这里为什么不加by?tha In this way they learned a lot