游客 购买了资源 Part VI Writing (写作题。根据题目与写作要求写作。请不要用附件或者图片上传作文！禁止雷同作文！禁止直接用AI写作！) Directions: For this part, you are allowed 30 minutes to write a short essay on ensuring security in mobile payment according to the given Chinese outline. You should write at least 150 words but no more than 180 words.
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