Cov taub dej kub tsis muaj hnub tas sij hawm kawg, tab sis kev tsim kho cov ntaub ntawv thiab kev tsim kho yuav maj nrawm muaj hnub nyoog dhau sijhawm. Ntawm no yog cov lus piav qhia ntxaws:
Kev laus qhov tshwm sim: cov ntaub ntawv thiab kev tsim kho cov hwj kub kub yuav maj tau muaj hnub nyoog dhau sijhawm, tshwj xeeb nrog kev siv ntau zaus. Qhov kev laus no tuaj yeem ua rau poob rau hauv kev ua tau zoo ntawm lub taub dej kub, xws li cov cua sov tsis zoo, thiab txawm yuav ua rau muaj dej tawg lossis tawg.
Kev tshuaj xyuas cov lus pom zoo: Txawm hais tias tsis muaj hnub tag hnub tag nrho, nws raug nquahu kom kuaj cov mob ntawm lub raj dej kub tsis tu ncua. Yog tias koj pom kev hnav, deformation, lossis cov tawv nqaij tawv ntawm cov nplaim dej kub, cov no yuav yog kev txiav txim siab hloov nws nrog ib qho tshiab.
