美国、欧洲和巴西的国家政策都支持使用食用作物来生产燃料。
National policies in the United States, Europe and Brazil support the use of food crops to produce fuel.
背景差异抠图算法在许多视觉系统中因被用作物体跟踪、检测的预处理步骤而被广泛使用。
Background subtraction technique has been widely used in many vision systems as a preprocessing step for object detecting and tracking.
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