RV series txuas ncaj qha txuas nrog lub tshuab nqus tsev nrawm nrawm yog ib qho tseem ceeb tshaj plaws nqus cov twj siv rau lub tshuab nqus tsev, thiab tau siv dav hauv thaj tsam ntawm lub tshuab nqus tsev, xws li txhawb nqa cov cuab yeej rau kev tshawb fawb, qhia thiab nqus cov ntawv thov uas xav tau siab thiab ib puag ncig lub tshuab nqus tsev tsawg, txhawb cov kab tsim khoom ntawm cov tshuab hluav taws xob thiab cov khoom siv hluav taws xob, cov kab tsim tawm ntawm cov xim xim raj, nqus kom khov kom qhuav, ntsuas ntsuas, tsim hluav taws xob qhov chaw, thiab lwm yam.