Cov lus qhia lub ntiaj teb cov khoom ntawm cov khoom tuav, ua haujlwm ua haujlwm thiab kev ntseeg tau ntawm cov khoom siv yog qhov tseem ceeb. Kev lag luam xws li kev sib tw los ntawm kev sib sau los ntawm kev rov ua dua nyob ntawm cov tshuab uas muaj peev xwm ua cov ntaub ntawv loj nrog kev ntsuas cov ntaub ntawv thiab xwm txheej. Ntawm cov myriad ntawm cov khoom siv siv, cov reciprocating

Partnumnnovations hauv kev lag luam thev naus laus zis yeej ib txwm tau tsav tsheb tom qab kev tsim khoom thiab kev ua haujlwm. Ntawm cov no, cov khoom sib sib nqus sib cais tau dhau los hloov pauv tseem ceeb. Cov evolution ntawm cov khoom siv no tsis yog tsuas txhim kho kev ua tau zoo tab sis als

Tus kheej hloov kho cov khoom siv hluav taws xob sai ntawm cov hlau ua dua tshiab thiab khib nyiab, kev sib cais ntawm cov hlau uas tsis muaj kev sib tw tau dhau los ua qhov kev sib tw tseem ceeb. Kev sib cais ib txwm ua rau muaj kev ua tau zoo thiab raug nqi zoo, ua kev lag luam nrhiav kev daws teeb meem tshiab. Eddy cur