[問題] 露營時的兩個手電筒
探險家富先生很喜歡一個人在荒野中露營。深夜時,每當他離開帳棚到方向不分的荒野走
動時,一定準備兩個手電筒。
如果不是為了預防電池用完,那會是為什麼呢?
puzzlez
2007/12/28
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