1. Ib leeg-sided caster, qhov no yog ib qho ntsiag to caster, nws nyob ntsiag to heev thaum dov, yuav luag tsis muaj suab nrov, yog li nws yuav tsis cuam tshuam rau tus neeg mob so.Lub log roj hmab ib leeg no muaj cov qauv hlau sab hauv.Nws cov khoom siv plhaub yog PP.Tus txheeb ze ntom ntom ntawm PP yog me me, ua rau nws yog ib qho ntawm cov teeb pom kev zoo ...
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