Lus nug: ¿Koj yuav ua li cas koj tshuaj ntsuam vibrating yeej tseem siv?
Teb: Ua tsaug rau koj kev nug koj.
Vibrating npo lug siv rau kev faib tawm thiab xaiv yuav tej khoom siv cov ntaub ntawv hauv qab no: lwm yam minerals tawm, quarries, tsev rau khoom, tus dej kev txuag thiab hydropower, thauj, cov tshuaj kev lag luam, casting, lwm yam.
