The tide has obliterated the footprints on the sand.

潮水湮没了沙上的足迹。

youdao

Footprints on the sand of time are not made by sitting down.

时光沙滩上的脚印是走出来的，不是坐出来的。

youdao

We should work hard to achieve greatness. Then we may say that we haven't wasted our time, and we may leave our footprints on the sand of time.

我们应当努力奋斗，有所作为。这样，我们就可以说，我们没有虚度年华，并有可能在时间的沙滩上留下我们的足迹。

youdao

He tracked the muggers' footprints on sand dunes over the course of several weeks, to get data for the maps, and established a pattern that helped police predict the attacks, so that they could lie in wait.

ECONOMIST: A new device puts an old skill to work