specific disease-free

• 无特定疾病的

specific disease-free的用法和样例：

例句

1. If this happens,a variety of wheat,say,that has been bred to resist a particular disease can become effectively ungrowable in as little as three years.
   如果发生这种情况，某种小麦，例如为了抵抗特定疾病而种植的品种，可能在短短的三年间就变得无实际种植价值。