Cov ntaub pua plag tshem tawm cov plua plav tau siv nyob rau hauv ancient sij hawm. Txawm hais tias lawv yuav tsis tau siv rau kev tshem tawm plua plav, lawv txhua tus muaj lub hom phiaj tib yam. Nws muab tso rau hauv lub tsev, ntawm qhov nkag, los yog muab tso rau hauv pem teb sab hauv.
Sab hauv tsev yog tsev, thaum sab nraum zoov yog qhov chaw sib sau ua ke rau plua plav. Qee tus neeg nyiam nteg cov ntaub pua plag ntawm lawv lub tsev mus taug kev yam tsis hnav khau, uas kuj yog ib txoj hauv kev los so lawv ob txhais taw thiab yooj yim heev.
Nws tseem huv heev thiab huv si hauv tsev. Thawj thawj ntawm cov ntaub pua plag tshem tawm plua plav yog cov ntaub pua plag. Txawm li cas los xij, nrog txoj kev loj hlob sai ntawm kev lag luam thiab kev txhim kho ntawm tib neeg kev ua neej nyob, tib neeg cov kev xav tau ntawm lub neej zoo kuj tau nce siab thiab siab dua, tsis yog qhov yuav tsum tau ua tsuas yog cov khoom siv hauv tsev yav dhau los. Kuj tseem muaj ntau yam kev ua tau zoo, thiab tsuas yog nrog kev ntshaw tuaj yeem muaj kev txhim kho.
Qhov no yog ib qho kev lag luam theorem ntawm kev ua lag luam, qhov twg kev sib tw ua rau kev txhim kho. Ntau cov thev naus laus zis tau tsim los ntawm kev sib tw thiab maj mam txhim kho, tom qab tag nrho, lub zog yog lub ntsiab lus tseem ceeb uas txhawb kev tsim cov tshuab tsim khoom. Kuj tseem muaj ntau cov tuam ntxhab ntawm cov ntaub pua plag tshem tawm plua plav. Txij li thaum muaj ntau manufacturers, yuav tsum muaj ntau hom plua plav tshem tawm cov ntaub pua plag. Tab sis txij li txhua tus neeg tsim khoom tuaj yeem muaj sia nyob hauv kev sib tw hnyav, nws qhia tau tias lawv muaj lawv tus kheej zoo thiab tuaj yeem tau txais ib feem ntawm cov ntaub pua plag tshem tawm.
Cov ntaub pua plag tshem tawm plua plav tau siv dav, hloov cov ntaub pua plag tsoos. Yog li dab tsi yog qhov zoo. Txawm tias muaj pes tsawg hom ntaub pua plag tshem tawm cov plua plav, lawv cov ntsiab lus yuav tsis hloov. Ua ntej, nws muaj peev xwm tshem tawm cov pa phem thiab tsis yooj yim rau cov kab mob, ua rau muaj txiaj ntsig zoo rau kev huv. Qhov thib ob, nws muaj qhov zoo nkauj zoo nkauj thiab tsis yooj yim deformed. Tom qab tag nrho, cov ntaub pua plag tshem tawm plua plav taug kev hauv qab koj txhais taw thiab feem ntau rubbed. Yog tias lawv yooj yim deform, nws yuav cuam tshuam rau tag nrho cov kev zoo nkauj ntawm chav tsev. Lwm qhov yog tias nws yog qhov ruaj khov thiab hnav-tiv taus, tsis yooj yim puas, thiab tej zaum yuav muaj cov khoom hnyav lossis cov khoom siv nrog pob zeb diamond fab khawb cov ntaub pua plag. Yog tias nws tsis ruaj khov, nws yooj yim rau kev puas tsuaj.
