noun · a city that is currently being surrounded or blockaded by an army

城内的百姓被困在围城之中，处境艰难。

noun · the act of surrounding and blockading a city or fortress to compel its surrender

敌军长达数月的围城终于结束了。

noun · 1947 novel by 钱钟书 Qián Zhōng​shū, filmed as a TV serial

《围城》是钱钟书先生最著名的长篇小说。