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and 22 per cent have no regulation in any respect. From your Cambridge English Corpus The ongoing usage of dependency ratios could be due to behavior or custom依靠这些结构,循环扇才能让风沿着一定的方向形成螺旋形的柱状风,风力大,风向聚,风距远。it is the custom for someone to do anything In my region, it i