Tom qab zoo sib tsoo riam dawb paug thiab polishing cov hniav, cov riam yog npog nrog yas zaj duab xis los tiv thaiv lawv los ntawm khawb.
Tom qab zoo sib tsoo riam dawb paug thiab polishing cov hniav, cov riam yog npog nrog yas zaj duab xis los tiv thaiv lawv los ntawm khawb. Tom qab ntawd peb cov neeg ua haujlwm tshaj lij yuav pib sib sau cov ntoo kov nrog steel rivets. Lawv kho tus kov los ntawm hammering cov hlau rivets nyuaj, yog li ntawd nws tuaj yeem xauv cov ntoo kom ruaj khov ntawm tus kov forged.
Lawv kuj xyuas kom paub tseeb tias cov ntoo zoo txuas thaum lawv ua haujlwm kom paub tseeb tias txhua yam ua tau zoo. Tus kov tom qab sib sau ua ke yuav xa mus rau polish kab dua rau ob polishing, kom paub tseeb tias lawv zoo saib thiab zoo tes zoo.
Kev mob siab rau pab cov neeg siv khoom daws lawv cov teeb meem nyuaj tshaj plaws thiab cov teeb meem thev naus laus zis.
Thov ua kom tiav daim ntawv hauv qab no, thiab peb pab neeg muag khoom yuav tiv tauj koj sai.
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