对“情人”形象变化的研究，有助于从整体上把握杜拉斯的创作轨迹和创作动机以及深入理解杜拉斯作品的文化价值和历史价值。
The research of the variations of"lover"is in order to follow Marguerite Duras'track of writing , motivation of creation and the cultural and historical values of her works.
使国际领域产品生命周期理论能更好地解释现代国际贸易投资的新现象，也有助于从时间角度在整体上理解和把握国际贸易与投资的大趋势。
It helps to explain the foreign trade and investment in the modern times, to understand and grasp the trend of the foreign trade and investment from time dimension's Angle.
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