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今天發現到只要天氣許可，公司內有一個人會每天走單程七英哩的路上下班。
我曾知道有人是跑單程四英哩，或是單程騎二十英哩的腳踏車，想不到竟然有人走單程七英哩的。
如果有一天發生危機，讓我必須走路回家，不知道我能不能走這三十英哩的路？