锈迹斑斑的盾牌诉说着战争的残酷。

The rusty shields tell a tale of ___war.

这场战争已经持续了三年，造成了巨大的破坏。

The ___war has lasted for three years, causing massive destruction.

市长宣布对城市污染发起全面战争。

The mayor declared ___war on urban pollution.