virus-free fruit tree

例句：

1. 1. We need to ensure that allfood is virus-free before it reachesour customers.
   我们需要确保所有食品在送达顾客之前都是无病毒的。
2. 2. The companyhas implemented strict measures to make its productsvirus-free.
   该公司已实施严格的措施，使其产品无病毒。
3. 3. Thenew vaccine is designed tobe virus-free and safefor use.
   这种新疫苗设计为无病毒且安全使用。