People with contagious diseases should be isolated. 传染病患者应予以隔离。
Her laughter's contagious! 她的笑声富于感染力！
Yawning is often contagious. 打哈欠常易于感染。
He's got a contagious laugh. 他的笑富有感染力。
It's a highly contagious infection. 这种病极易传染。
Zack Lemann, Visitor Programs Manager at the Audubon Insectarium, goes on to explain the exhibits with contagious enthusiasm. 查克黎曼是奥杜邦昆虫馆的访客计画负责人，他用有感染力的热情来解释了这些展览。