从理论上证明了将物体高度变化率大的一面朝光栅放置，可以进一步拓宽余弦变换法的测量范围，以文中的系统为例，其扩大倍数可达到原来的5 7倍，远大于3倍。
It is also proved that the measuring range is expanded more by placing the object facing the grating reasonably, system mentioned, the multiple is 57, greater than 3.
然而，他补充道：“这对于成比例的损失率中小小的变化都高度敏感，因为这些有毒资产的数目太大，并且被掩盖的时间太长。”
However, he added: "This is highly sensitive to small changes in the proportionate loss rate because the amount of assets is so big and the length of time that the assets are covered."
由于户外情况高度变化，并且变得很快，在户外环境测量环境烟害的去除率是困难的。
It is difficult to measure ETS removal rates in outdoor Settings since outdoor conditions are highly variable and change rapidly. (Page III-13).
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