sporadic 的意思是零星的，偶尔发生的。 

Iran’s official news agency reported sporadic protests erupted in cities across the country one day after the government announced a surprise decision to ration gasoline and lift its price. 伊朗官方通讯社报道，政府出人意料地宣布了对汽油进行定量供应并提高油价的决定，一天后伊朗各地爆发了零星抗议活动。