5an instructor demonstrates water combat techniques to prospective SEALs.

教官在给准海豹队员们演示水下的作战技巧。

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5an instructor demonstrates water combat techniques to prospective SEALs. The sailors then pair off, and practice the technique in a pool.

教官在给准海豹队员们演示水下的作战技巧。然而队员们分别开始捉对撕杀，在池中演练实战技术。

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Forests and tree cover combat land degradation and desertification by stabilizing soils, reducing water and wind erosion and maintaining nutrient cycling in soils.

通过稳定土壤，减少水蚀和风蚀并维持土壤养分循环，林木覆盖能够防止土地退化和荒漠化。

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The WMF also called for immediate action to combat water infiltration and structural deterioration at the cathedral church of St Michael in Coventry, England.

BBC: An increase of urban areas on watch

To try to combat the problem, the agency has twice released better-oxygenated water from Kielder Reservoir into the river in an effort to help salmon move out of the estuary and into the freshwater section of the river.

BBC: Hundreds of salmon die in heat

But Zafar Adeel of the United Nations University International Network on Water, Environment and Health, an expert on water management and a leading author of the report, warned that more needed to be done to combat desertification.

CNN: Growing deserts 'a global problem'