研究人员长期以来一直梦想用正常基因取代突变基因的方法治疗血友病，癌症等各种疾病。
Researchers have long dreamed of treating diseases from hemophilia to cancer by replacing mutant genes with normal ones.
第二组的方法是“突变”方法，他们创建一个新的查询（）对象与相关（内部的）属性增强或取代。
The second set of methods is the "mutator" methods, they create a new query() object with the relevant (internal)attribute either augmented or replaced.
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