Lub ntsiab lus tseem ceeb ntawm cov khoom siv kho vajtse

Cov khoom siv kho vajtse xa mus rau kev pabcuam thiab cov khoom siv tsim khoom siv hauv lub neej txhua hnub thiab kev tsim khoom lag luam.

Lub npe tau tshwm sim los ntawm qhov tseeb tias cov khoom siv kho vajtse thaum ntxov feem ntau yog ua los ntawm tsib hlau: kub, nyiaj, tooj liab, hlau, thiab tin. Cov khoom siv kho vajtse niaj hnub no tsis txwv rau cov hlau; lawv tau siv dav siv tsis yog- cov khoom siv hlau xws li yas thiab fiberglass.

Lub hauv paus chiv keeb ntawm cov cuab yeej kho vajtse tuaj yeem taug qab tau ntau txhiab xyoo. Tib neeg thawj zaug tau nkag mus rau Hnub Nyoog Pob Zeb, tom qab ntawd lub Hnub Nyoog Bronze, thiab nrog rau kev tshwm sim ntawm Hnub Nyoog Hlau, cov cuab yeej hlau tau tshwm sim sai heev.