Cov koob yees duab ceev ceev yog qhov tseem ceeb rau kev ntes ultra-ceev txav nrog qhov tseeb, dav siv hauv kev sim kev lag luam, kev ntsuam xyuas kis las, thiab kev tshawb fawb tshawb fawb. Cov koob yees duab no muab cov ncej siab, ntsuas kev txav siab siab, thiab cov duab zoo dua los sau cov xwm txheej tsis pom ntawm qhov muag liab qab. Hauv kev tsim khoom, cov koob yees duab ceev ceev pab kom tswj tau qhov zoo los ntawm kev txheeb xyuas qhov tsis xws ntawm cov kab ntau lawm. Txawm hais tias rau kev siv tshuab lossis kev ua yeeb yaj kiab qeeb qeeb, cov koob yees duab no muab kev ua tau zoo tshwj xeeb. Tshawb nrhiav cov kev hloov tshiab tshiab hauv kev siv lub koob yees duab ceev ceev thiab lawv cov kev cuam tshuam rau ntau yam kev lag luam.