（不急）i keep myself in good shape by running five miles a day.
i keep myself in good shape by running five miles a day.
起到什么作用?最好给几个例子.
人气：367 ℃ 时间：2020-06-03 06:45:36
解答
by+动作ing是介宾结构做状语,这里by是指通过.方式的意思.比如,i go to school by bike,我骑车上学,即.通过骑车的方式.
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