Hauv qhov hluav taws kub, kev nyab xeeb yog qhov tseem ceeb dua, cov iav hluav taws kub zoo hauv cov khoom tawg yog lub xeev obtuse, nws cov fragments yuav tsum yog tempered iav fragments me me, uas yog hais tias, txawm tias puas yuav tsis ua mob rau tib neeg lub cev.

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