Flexible Joint yog ib qho kev sib txuas nrog kev ua haujlwm yooj yim, tab sis qhov tseeb, nws feem ntau yog hais txog steel hloov tau yooj yim sib koom ua ke, uas yog, clamp saj zawg zog sib koom ua ke thiab cov roj hmab hloov tau yooj yim. Cov pob qij txha yooj yooj yim, raws li lub npe qhia, yog cov khoom sib txuas nrog cov haujlwm hloov tau yooj yim, tab sis qhov tseeb, lawv feem ntau xa mus rau steel hloov tau ...
Nyeem ntxiv