行迹的英文：
trackway

"Your footprints by our door, where I had watched you go, Were hidden, every one of them, under green moss,"
门前迟行迹,一一生绿苔

"But in fallen leaves that have heaped the bare slopes, How should I ever find his footprints!"
落叶满空山,何处寻行迹。

He spotted a suspicious character peeping into the house.
他发现一个行迹可疑的人向屋内窥视。