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for color in colors {。新收录的资料对此有专业解读

粮食安全不仅取决于“种”，还取决于“地”。高标准农田建设与节水灌溉设施是确保粮食稳产增产的物理基础。，详情可参考新收录的资料

while repeats a block as long as a condition is true: