对比研究了城市系统与自然生态系统物质代谢的主要差别。
Major differences in metabolism between urban system and natural system are compared and studied.
北美与西欧的农业生态系统差别太大难于比较。
The North American and Western European agroecosystems are too different to compare.
与当地春型小麦品种相比，成熟期因各地生态条件不同而有差别。
In comparison with the local spring wheat varieties, the maturity period was very close with little variations.
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