森林转移，作物少产，疾病北进。

Forests shift, crops suffer, diseases move north.

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渤海的环流特点是北进南出。

TheYellow Sea warm current flows northwestwardly into the north of Bohai.

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两国的这种北进政策及扩张政策，不可避免地使两国短兵相接。

This kind of north entry policy and extension policy made it inevitable that the two countries frequently close combat. Third, the diplomatic relation between the two countries in tenth century.

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