Hauv kev tsim khoom lag luam, kev tswj xyuas qhov chaw ua haujlwm huv thiab nyab xeeb yog qhov tseem ceeb rau kev tsim khoom, khoom zoo, thiab kev noj qab haus huv ntawm cov neeg ua haujlwm. Cov tshuab nqus tsev nqus tsev vacuum ua lub luag haujlwm tseem ceeb hauv kev ua tiav lub hom phiaj no los ntawm kev tshem tawm cov plua plav, khib nyiab, thiab lwm yam ...
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