脚印 (jiǎo yìn): след

The children ran barefoot on the beach, leaving a trail of footprints behind them; as soon as the tide came in, they were washed away.

The police found a set of unfamiliar footprints in the snow, stretching all the way into the depths of the forest.

He walked into the freshly mopped living room, leaving clear wet footprints on the floor; one look and his mother frowned.

Archaeologists discovered footprints left by ancient humans in the cave; these footprints have been preserved for tens of thousands of years.

He climbed up along the mountain path and, looking back, saw his own footprints left step by step on the steep snowy slope.