Nrog rau kev txhim kho txuas ntxiv ntawm tib neeg kev paub txog kev tiv thaiv ib puag ncig, cov qhov rooj ntoo hluav taws feem ntau tshwm sim hauv lub neej. Lub qhov rooj hluav taws kub yog ua los ntawm cov khoom siv hluav taws xob hluav taws xob los yog cov khoom siv hluav taws kub, txais tos nrog peb tham.

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