并推导出有关计算公式，给出图表曲线。
It deduces a formula for calculation and draws the curve of the charge.
即使没有统计成绩的曲线图表，作弊也会“毒害”课堂，其他人可能会感到竞争压力过大而加入作弊的行列。
Even if there is no curve, cheating "poisons" the classroom, and others may feel pressured to join in.
我们在图表上绘出了大约有八个点的曲线。
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