Kawm seb vim li cas rab riam pob zeb diamond thiaj li ci ntsa iab lossis tsis txiav. Xyuas seb puas sib txuas, RPM, lub zog, dej ntws thiab kev hnav, tom qab ntawd txiav txim siab seb puas yuav hnav lossis hloov nws kom muaj kev nyab xeeb ntawm qhov chaw.
Ib tus neeg muab khoom siv hauv kev tsim kho vaj tse rau 30 xyoo.
Lus
