At noon the spaces between the sensors will hide fluctuations that the computer will not know about, tiny deviations from the average.

【译文】

正午时分，传感器之间的距离会掩盖计算机无法知道的波动和任何偏平均值的变化。

【讲解】

that the computer will not know about系定语从句，修饰sensors。

【单词和短语】

fluctuate：波动，涨落，起伏（if a price or amount fluctuates, it keeps changing and becoming higher and lower），

例如：
You cannot match in straight line to the victory; you fluctuate to it.
你不可能一帆风顺地走向胜利，而要经过许多波折才能达到。

The demands fluctuate seasonally。
需求随季节而变动。

fluctuate的名词形式为fluctuation。

deviation n. 偏离，偏差，出轨

There was little deviation from his usual routine.
他没有什么反常的举动。

动词形式是deviate

Don't always deviate to minor issues.
不要老是偏离到次要问题上去。

You will not deviate from your present course.
你不能偏离目前航线。