一、將下列英文翻譯成中文：（20 分） Rice plants possess an amazing assortment of genes that offer protection from a host of diseases. The farmers’ predicament is that no single variety has every gene and that all plants are vulnerable to some diseases. Breeders have exploited disease-resistance genes in rice for nearly a century, but conventional breeding is painstaking and time-consuming. Often a decade or more is needed to produce desired traits.