この習慣しゅうかんもそのうち滅ほろびるんじゃない？

kono shuukan mo sono uchi horobiru n janai?

This custom will probably die out eventually, don't you think? casual

かつて栄さかえた文明ぶんめいが滅ほろびました。

katsute sakaeta bunmei ga horobimashita.

A civilization that once flourished perished. neutral