Lub nplhaib siab qhov chaw phaj yog tsim thiab tsim raws li lub teb chaws tus qauv, thiab yog ib tug tshwj xeeb xeem ntsuas rau ntau npaum li cas ntawm cov qauv qauv ntawm daim ntawv thiab cardboard.
90 ° tshem tawm fixture
