词典释义：
双语例句
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However, the virulence of wheat strip rust varied frequently and produced new virulent RACES which led to the breakdown of resistance genes and the periodical prevalence of wheat strip rust.
但是小麦条锈菌毒性变异频繁，可以通过变异产生新的毒性小种，导致小麦品种抗病基因失效，引起小麦条锈病周期性流行危害。