短语词组短语mutable alleles 可变等位基因mutable gene 突变基因;易变基因mutable objects 可变对象;可变物件mutable string 字符串;可变字符串mutable variable 可变变量mutable e 可变的;易变的mutable copy 可变副本mutable references 可变引用mutable site 易变位点 返回 mutable