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.
MathML在这里扮演一个明显的角色，即充当zip容器中原生的文件格式，或者作为不同系统之间的协作层。
MathML has an obvious role to play here, either as the native file format within the zip container or as an interoperability layer between different systems.
由此我们不难分辨出无效合同和可撤销合同在经济合同中充当着不同的角色。
From this we are not difficult to distinguish the void contract and may abolish the contract to play the different role in the economic contract.
在不同时期，同一个人或公司可能会分别充当经纪商或自营商的角色。
The same individual or firm may function, at different times, either as broker or dealer.
在不同时期，同一个人或公司可能会分别充当经纪商或自营商的角色。
The same individual or firm may function, at different times, either as broker or dealer.
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