首先,是movies才對(duì)吧.因?yàn)槲沂强空Z感來回答問題的,所以這個(gè)問題我很難解釋.但是,答案的確是by watching.
.
to do ____by doing _____
就是,要完成某件事情,要做某件事情.
比如：going home by bike
就是要用（騎）腳踏車回家..
這里的狀況也有點(diǎn)相似,也就是要用英文電影來學(xué)好英文.也可以說是“定”的啦..
比如：
I learnt how to speak English by taking English lessons.
I learnt the different meanings of different words by looking up the dictionary.
就是這樣啦~這就是我的答案.