Drain; Backwater; Floor drain; Outdoor measure.
给排水；回水；地漏；户外计量。
It is difficult to measure ETS removal rates in outdoor Settings since outdoor conditions are highly variable and change rapidly. (Page III-13).
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).
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。
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