Cov khoom lag luam hauv qab no yog 50 ntawm cov roj tsheb ua kom zoo nkauj, thiab cov roj ntsha ua tau zoo li no, thiab cov xim ua kom zoo nkauj thiab cov xim muaj zog, txhua tus yog qhov nrov heev hauv kev ua lag luam, thiab nws tseem yog Peb cov khoom lag luam txaus siab .
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