以下为句子列表：
英文: The waste load is regarded as a stochastic variable following the log-normal probability distribution based on statistical data, and the constrains on water quality levels are expressed in a probability form.
中文: 假设排污量是服从对数正态分布的随机变量，并且以潮周期内水质达标的概率作为衡量控制点达标的依据。
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