At the beginning of a marathon training program, many participants can't imagine themselves running more than 5 miles.
在刚开始进行马拉松长跑训练时，要跑上5英里，许多参训者连想都不敢想。
At the beginning of a marathon training program, many participants can't imagine themselves running more than 5 miles.
在刚开始进行马拉松长跑训练时，要跑上5英里，许多参训者连想都不敢想。
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