There maybe many layers in a database, e. g. soil type, elevation, land use, land cover.

一个数据库中可能有许多层，例如土壤类型、海拔、国土利用、国土覆盖。

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The effects of vegetation type, rainfall intensity, surface crust, and weed cover on rainfall infiltration and runoff on grassland and bare land were studied under simulated rainfall conditions.

利用野外模拟降雨试验，研究了植被类型、降雨强度、地表结皮、覆盖杂草等对荒草地和裸地降雨入渗、产流的影响。

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The effects of vegetation type, rainfall intensity, surface crust, and weed cover on rainfall infiltration and runoff on grassland and bare land were studied under simulated rainfall conditions.

利用野外模拟降雨试验，研究了植被类型、降雨强度、地表结皮、覆盖杂草等对荒草地和裸地降雨入渗、产流的影响。

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