通过比较每个位置的平均读数，去掉正常的水位变动，他就能计算出湖底层的任何变化。
By comparing the average readings at each place and filtering out normal water movements, he can calculate any changes in land levels.
通过比较每个位置的平均读数，去掉正常的水位变动，他就能计算出湖底层的任何变化。
By comparing the average readings at each place and filtering out normal water movements, he can calculate any changes in land levels.
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