弗农只是用产品周期理论来解释国际贸易和投资的流向，却没有深入到其背后的原因。
Vernon used product life cycle explain foreign trade and investment but didn't give the inside reasons.
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.
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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