20 xyoo keeb kwm hauv kev txhim kho thiab tsim khoom siv fiber ntau ceramic.
20 xyoo kev tshawb fawb tob thiab txhim kho cov khoom lag luam fiber ntau.
20 xyoo hauv kev xa tawm thiab tsim qauv kev lag luam [chaw tshawb fawb + kws tshaj lij kev sab laj + ceramic fiber ntau enery-txuag tsim rau cov cua sov ua haujlwm].
20 xyoo kev tsom mus rau kev tshawb fawb ntawm kev ua haujlwm siab txuag hluav taws xob rau cov cua sov.