Qhov rooj zawv zawg qhov rooj yog qhov tseem ceeb ntawm txhua lub tsev, muab kev yooj yim thiab yooj yim nkag mus rau lub ntiaj teb sab nraud.Txawm li cas los xij, dhau sijhawm, cov kab no tuaj yeem ua rau av, plua plav, thiab grime, ua rau lawv lo thiab ua rau nws nyuaj rau qhib thiab kaw qhov rooj.Tsis tsuas yog qhov no saib unsightly, ...
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