Hauv av ntsia hlau pawg, tseem hu ua ntsia hlau pawg lossis stud pawg, yog ib qho khoom siv hauv kev tsim kho vaj tse thiab hauv paus engineering.

Hauv av ntsia hlau pawg, tseem hu ua ntsia hlau pawg lossis stud pawg, yog ib qho khoom siv hauv kev tsim kho vaj tse thiab hauv paus engineering.
