From practical experience, the establishment of a "cooling-off period" system is mandatory to prevent the effective methods of sales.
从实际经验，设立一个“冷却期”制度是强制性的，以防止有效的方法销售。
From practical experience, the establishment of a "cooling-off period" system is mandatory to prevent the effective methods of sales.
从实际经验，设立一个“冷却期”制度是强制性的，以防止有效的方法销售。
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