Hauv lub hnub nyoog ntawm cov thev naus laus zis siab tshaj lij, lub teeb yooj yim kom zoo, lossis chemvight, tseem yog staple. Nws cov xwm txheej kev siv yog rau kev kos cim, kos npe, thiab muab cov teeb meem qis}}} Cov txheej txheem qib chaw uas tsis muaj lub teeb pom kev zoo li lub teeb dawb. Lawv yog dej tsis tau, tsis tas yuav tsis muaj roj teeb, thiab muaj lub teeb heev thiab txhim khu kev qha.
Lawv tuaj yeem siv tau los cim cov chav ua kom meej, cov kev mus, tsaws cov cheeb tsam, lossis kev raug mob. Cov xim sib txawv tuaj yeem txuas cov lus sib txawv. Txoj kev ua tau zoo yog yooj yim, vam tau, thiab passive teeb uas txhim kho kev nyab xeeb thiab kev sib koom tes tsis muaj kos npe rau hluav taws xob.
Xaiv nqa ob peb lub cav teeb yog qhov teeb meem ntawm kev npaj tos yooj yim. Lawv yog qhov redundant, tsis - kev daws teeb meem rau ib qho teeb meem uas nquag muaj. Lawv txoj kev ntseeg tau thiab yooj yim kom lawv yuav nyob nrog cov khoom siv ua tswv yim rau ntau xyoo tom ntej.
