Kev ua haujlwm kom tsim nyog ntawm lub qhov rooj qhov rooj tub yees lossis lub tub yees txias yog qhov tseem ceeb, thiab kev ntxuav yuav tsum yog qhov tseem ceeb rau kev ua haujlwm kom ua haujlwm. Yog tias tsis muaj kev ntxuav, av, hmoov av, thiab gime yuav txhim tsa, thiab yuav ua rau muaj kev ua tsis tau zoo. Raws qab
Mastering txoj kev kos duab ntawm kev tswj hwm ob chav ci iav Sliding Didingdouble, muab kev sib xyaw ua ke, kev txuag hluav taws xob, thiab kev ua haujlwm zoo. Lawv ua haujlwm ua kev sib xyaw ua ke
Yav dhau los, cov ncej puab qab rooj yuav tsum tau welded artificially, lub zog wel plees, nws yuav yog ib qho teeb meem kom sib sau ua ke lub khob insulated zoo. Qee zaum nws yuav ua rau insu
Peb txaus siab heev rau ob qho tib si ntawm cov neeg siv khoom tus cwj pwm thiab cov khoom lag luam. Cov khoom tau xa khoom sai sai thiab ntim kom zoo zoo thiab nruj.