Cov ris tsho hauv qab yog cov khoom ntawm cov khaub ncaws hnav hauv qab cov khaub ncaws sab nrauv, feem ntau nyob rau hauv kev sib cuag nrog daim tawv nqaij, txawm hais tias lawv yuav muaj ntau tshaj li ib txheej.Lawv pab tiv thaiv cov khaub ncaws sab nrauv los ntawm kev ua qias tuaj lossis puas los ntawm lub cev tawm, kom tsis txhob muaj kev sib txhuam ntawm cov khaub ncaws sab nrauv tawm tsam ntawm daim tawv nqaij, ...
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