Keeb kwm
Tib neeg tau siv tooj liab rau ntau txhiab xyoo. Archaeological discoveries ntawm tombs qhia tias cov neeg Iyiv siv tooj liab thaum ntxov li 6, 000 xyoo dhau los nyob rau hauv prehistoric lub sij hawm. Tooj liab yog cov hlau qub tshaj plaws siv los ntawm tib neeg cov poj koob yawm txwv. Nws muaj ntau yam khoom zoo heev thiab kev ua haujlwm zoo, uas tsis yog tsuas yog ua kom muaj txiaj ntsig zoo rau kev vam meej ntawm tib neeg lub neej, tab sis kuj tseem tsim kev siv tshiab txuas ntxiv nrog kev txhim kho ntawm tib neeg kev vam meej. Tooj liab yog ob qho tib si qub hlau thiab niaj hnub engineering khoom uas muaj qhov tseem ceeb thiab muaj zog. Tam sim no, tib neeg tau nkag mus rau cov yeeb yuj, muaj kev vam meej hauv zej zog uas muaj cov ntaub ntawv siv hluav taws xob thiab hluav taws xob, uas tau qhib qhov dav dav rau kev siv tooj liab. Tooj liab yog siv los ntawm tib neeg nyob rau hauv daim ntawv ntawm ntau yam hlau, alloys thiab cov tebchaw, thiab tau nkag mus rau hauv txhua yam ntawm kev tsim khoom thiab lub neej, dhau los ua ib qho tseem ceeb thiab tseem ceeb hlau rau tib neeg kom nkag mus thiab ua tiav kev loj hlob sai hauv lub xyoo pua 21st. .
