有云区也可能是输射亏损区，因为云有较高的反照率。
Cloudy areas can also be areas of radiation deficit because of their higher albedo.
河道采砂可能会增加河流的输沙，也可能会减少河流的输沙。
Instream sand mining can increase or decrease of the river sediment discharge.
也可能是由于出乳口堵塞或者输乳管被皮肤堵塞。
They can be caused also by a plugged duct or by skin blocking a milk duct.
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