在道德沦亡的时代，我们该何去何从？

What do we do in times of moral upheaval?

由这点看来，人心不古，道德沦亡，这是有原因的。

From this, we can see that there are reasons why people no longer follow ancient ways, and why moral values have declined.

尽管从长期来看，城市的规模会扩大、数量会增长，但城市也会衰落沦亡。

Though cities grew in size and number for long periods, they could decline and fall, too.