footprints on the sands of time

例句：

1. 1. The hikers left behind numerous footprints in the snow.
   徒步旅行者在雪地上留下了无数的脚印。
2. 2. Thedetective found a set offootprints leading to the crimescene.
   侦探发现了一串指向犯罪现场的脚印。
3. 3. The children were playing in thesand, leaving their footprints everywhere.
   孩子们在沙子里玩耍，留下了到处都是的脚印。