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在东、北朝向的木窗台下,墙身出现霉变的现象十分普遍。这主要是雨水直接从窗台渗入或是从窗棂与玻璃的间隙中油灰脱落时进入窗内而渗入窗下墙身造成的。
Under the wooden sill facing east and north, mildew is common in the wall. This is mainly caused by rainwater seeping directly from the window sill, or entering the window when the putty detaches from the gap between the window sill and the glass and infiltrates into the wall under the window.