网络经济的一个最重要特征是网络外部性。
The most important feature of the network economy is network externality.
农业是我国国民经济的基础，同时又是一个具有外部性的弱质产业。
Agriculture is the foundation of our country economy and the weak industry which has externalities.
农业是我国国民经济的基础，同时又是一个具有外部性的弱质产业。
Agriculture is the foundation of our country economy and the weak industry which has externalities.
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