Raws li kev kho mob siv los kho cov hniav lwj, puas los yog hnav-tawm cov hniav rov qab mus rau nws qhov qub kev ua haujlwm thiab cov duab, peb cov kev daws teeb meem kho kom zoo tshaj plaws muaj nyob rau hauv kev kho hniav kho hniav, uas muaj xws li scanning mus rau tsim thiab milling thiab lwm yam.