Simbi ndiro inodururwa nesimbi yakanyungudutswa, yakanyoroveswa uye yakatsikirirwa musimbi yakatsetseka.Iyo yakati sandara, ine rectangular uye inogona kukungurutswa yakananga kana kucheka kubva pahupamhi tambo yesimbi.Zvinoenderana nehupamhi hwesimbi ndiro, yakaonda simbi ndiro
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