Such object-oriented tool support makes the inheritance structure of a system explicit.
这种面向对象工具支持使得系统的继承结构清晰可见。
Although object databases can seem somewhat exotic, they are a useful tool for users of dynamic, object-oriented languages.
尽管对象数据库似乎有点新奇，但它们对于面向对象的动态语言的用户非常有用。
Closures can be a useful tool not only for procedural programming but also for object-oriented programming.
闭包不但是过程序编程的有用工具，而且是面向对象编程的有用工具。
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