从对象建模程序的角度公平地讲，按照is - a模拟类型的能力就是面向对象的本质。
It's fair to say that from an object modeler's point of view, the ability to model types in is-a terms is the heart of what object-orientation is about.
在一个模拟的环境下，这些类型的任务不能可靠地完成。
These kinds of tasks cannot be done as reliably in a simulated environment.
不同的测试工具设法模拟不同类型的用户环境。
The different test tools tried to simulate different types of user environments.
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