1. Kev tsim thiab kev tsim kho: Ua ntej tshaj plaws, kev tsim thiab kev tsim cov casters yuav tsum tau ua raws li qhov xav tau thiab cov khoom siv kho mob tshwj xeeb.Qhov no suav nrog kev txiav txim siab cov khoom siv, lub peev xwm thauj khoom, qhov ntev, kev tsim kho, thiab lwm yam. 2. Kev npaj cov khoom: Accord...
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