Want a funny joke, beg.

Once upon a time, Americans went to China for sightseeing. One day, I saw two China workers on my way to China. One dug a hole by the roadside with a shovel every three meters, and another worker immediately backfilled the hole just dug by the previous worker, and so on. ....

Out of curiosity, the American asked the first China worker, "Why did the man behind you fill in the hole as soon as you dug it?" ? 』

China workers replied, "We are greening the roads. I dig a hole, the second person plants trees, and the third person fills the soil. But the second man didn't come today.