VOA慢速英语:夏威夷与其他岛屿因被海洋隔离限制了病毒传播

tourism - n. the business of visiting a place for pleasure

quarantine - n. the period of time during which a person or animal that has a disease or that might have a disease is kept away from others to prevent the disease from spreading

opportunity - n. the chance to effect something

at the expense of - expression. using someone or something to one's own benefit