Kev cais ntawm cov tsheb
Qhov kev cais ntawm cov tsheb tsis muaj tseeb. Yog tias lawv txawv raws li qhov kev siv, lawv feem ntau muab faib rau cov neeg tsav tsheb, tsheb thauj khoom, neeg caij tsheb thiab cov tsheb thauj khoom (lossis tsheb) thiab cov tsheb tshwj xeeb. Muaj ntau hom tsheb tshwj xeeb, suav nrog tub ceev xwm tsheb, tsheb tua hluav taws, tsheb thauj neeg, tsheb thauj khoom, cranes, limousines, coaches, tsheb tshwj xeeb rau cov neeg xiam oob qhab, tsev loj cuj tsheb thiab mloog lus. Tos.
Yog hais tias tso tawm raws li cov roj siv, nws tau muab faib ua roj tsheb, tsheb dais, hluav taws xob, tsheb hydrogen, cov tsheb ciav hlau, roj tsheb, tsheb tsheb, thiab lwm yam.