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qhov twg thiaj nrhiav tau cov ntaub qhwv ntaub nees zoo tshaj?

Peb muab cov ntaub qhwv cov nees zoo tshaj plaws: cov ntaub qhwv zoo sib xws rau nees, qhov zoo tuaj yeem sib piv nrog tib daim ntaub qhwv nees ua los ntawm 3M, cov ntaub qhwv ntaub nees no haum rau kev sib tw nees, vim tias kev sib koom ua ke yog qhov muaj zog, thiab cov ntaub ntawv tsis sib haum yog phooj ywg mus rau tus nees.

Tsis tas li cov khoom siv nees qhwv tau siv rau nees yuav kho, tshwj xeeb tsim thiab siv rau nees.