解释：了解古代不了解现在，称为愚昧无知，那么儒生就只能称作愚昧无知的人了。

The dairy industry must evolve with consumer needs, or we risk becoming irrelevant.

The most sustainable building is the one that already exists.

矿工的技能和奉献精神与他们带到地面的煤炭一样宝贵。

我学得越多，就越意识到自己不知道的还有多少。

"Time is a thief, but it's also a giver. You just have to be willing to see the gifts."