Qhov hluav taws kub shutter curtain nto los ntawm cov khoom siv kis tau tus mob thiab kev tswj xyuas kom ncav cuag lub shutter lifting. Ua si lub luag haujlwm ntawm kev tiv thaiv hluav taws, hluav taws kub rwb thaiv tsev, cov khoom zoo li du thiab zoo nkauj, cov duab tshiab.

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