Arguments cannot be solely polemical, but must derive from a clear, well-supported evaluation of the texts, lecture materials, videos or films.
论证不能仅仅是辩驳，必须建立对课文、讲课资料、录像或影片的清楚且论据充分的评价基础上。
Tax official: well, now that we can not acquire needed materials, we can derive the your taxable receipt from your expense.
税务局：通过办事处的费用水平来推算其应税收入。
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