1the newfound virus is behind the kills
2his hand was burnt by the iron when he was ironing at home
3 there is no cure for this virus in fish in an ecosystem as large as the great lakes basin
參考答案:1.杀毒之后，又发现有新病毒了。
2.他在家里烫衣服的时候把手烫伤了。
3.在像整个大湖这么大的生态系统里，鱼类的病毒感染问题是无法避免的。