Lub tshuab tau yoog raws li cov tawv tawv thiab tawv tawv rau qhov yuav tsum tau thickness hauv kev lag luam ntawm cov khoom lag luam tawv, qhov dav ntawm uas yog 8 hli. Nws tuaj yeem tiv thaiv cov tuab ntawm cov khoom cais los txhim kho cov khoom lag luam zoo thiab cov kev sib tw ntawm kev lag luam.