许多士兵在那场爆炸中不幸遇难。

Many soldiers ___perished in the explosion.

如果不及时修理，这座老房子很快就会彻底毁坏。

Without timely repairs, this old house will soon ___perish completely.

如果不加以保护，这些古老的语言将逐渐消失。

These ancient languages will ___perish if not protected.