Xov xwm kev lag luam

Cov pwm / pwm rau cov pob zeb ua yog ib qho ntawm qhov tseem ceeb kom ntseeg tau tias qhov haujlwm ua haujlwm ib txwm ntawm lub tshuab. Vim tias nws cov haujlwm nquag ua haujlwm, nws yuav muaj hnub nyoog tom qab ua haujlwm rau ib lub sijhawm. Tshwj xeeb, thaum lub pob zeb sib tshuam zeb yog hnav rau qee yam, nws tsis tuaj yeem muab xauv thaum ua tiav txoj kev saum npoo av, ua rau tsis ua tiav.

Curbstone pwm yog cov qauv qauv siv los tsim cov cement cement cement. Curbstones, lossis cov pob zeb ntug kev, feem ntau ua los ntawm granite lossis cement precast cov ntaub ntawv thiab siv los txhais cov ciam av deg.

Thaiv Ua Machine, tseem hu ua Cib Ua Machine, yog tsim rau kev tsim cov khoom siv thiab tau siv dav hauv kev tsim kho kev lag luam. Lub block ua cov tshuab muaj peev xwm tig ntau cov khoom siv raw, suav nrog xis mas, loj, lub zog, thiab lwm yam khoom lag luam los ntawm cov txheej txheem tshwj xeeb.