这部分是论文的核心部分，即在正确的教学方法指引下，教师在教学中充当不同的角色，从而提高大学英语教学水平。
This section is the focus of the thesis, aiming at teachers' multi-functions facilitating college English teaching with proper pedagogy.
要做到这一点，您必须实现一个objectfactory类，这个类将充当工厂的角色，创建不同资源对象。
To do so, you must implement a class called ObjectFactory that will act as a factory for creating different resource objects.
不同于鲍威尔，赖斯不会充当制衡切尼和拉姆斯菲尔德的角色。
Unlike Mr Powell, Ms Rice will not try to be a counterweight to Messrs Cheney and Rumsfeld.
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