Thaum tsiv, xws li lub hnab yas loj ntawm tonnage tuaj yeem muab tus kheej sau thiab tom qab tig, uas yooj yim thiab tsis muaj teeb meem. Thib ob, vim tias nws muaj peev xwm, muaj kev tiv thaiv zoo los tiv thaiv kev ua tau zoo, nws yog qhov tsim nyog rau ntim ntawm ntau cov khoom siv tshuaj lom neeg. Tom qab muab cov khib nyiab, cov nqi seem yog me me, yooj yim los ntxuav thiab tuaj yeem rov siv dua ntau zaus. Qhov zoo ntawm cov thawv loj yas yog lub neej ntev, nyob rau hauv ib txwm nyob rau hauv kev thauj mus los thiab txhaws, ntxiv rau kev ua haujlwm thau khoom thiab thau tawm, nws siv tau tsawg dua 20 zaug.
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