风尘仆仆 fēngchén-púpú
[be travel-worn and weary;endure the hardships of a hard journey live in one's trunks] 风尘;旅途中所受的辛苦。仆仆:疲劳的样子。形容奔波劳苦的样子
两个口渴的旅客,在风尘仆仆的艰苦跋涉后偶然发现了这湖泊