The private[this] members are only visible to the same instance.
这些private[this]成员仅对同一个实例内的成员可见。
An instance of an SQLObject class has all its fields available as members.
sqlobject类的实例的所有字段可用作成员。
However, static members cannot see any instance variables unless they define that instance.
然而，静态成员不能看到任何实例变量，除非它们定义实例。
However, static members cannot see any instance variables unless they define that instance.
然而，静态成员不能看到任何实例变量，除非它们定义实例。
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