Cov no muaj feem xyuam rau cov sib txuas xov xwm nrawm nrawm , kom pab koj nkag siab sai dua thiab nthuav dav hydraulic ua lag luam. Vim tias kev ua lag luam rau cov kauj ruam nrawm nrawm yog hloov kho thiab hloov pauv peb lub vev xaib, yog li peb yuav qhia koj cov xov xwm tshiab tshaj plaws ua ntu zus.