During the ZTO grow procedure, feeding rod is melted, the gas from hole of low-density rod dissolved in the melt to form gas bubble. When a high rotation rate is applied, due to the centrifugal force effect, the gas bubbles are moved to the center axis and coalesced to grow (large) (或删掉grow）. With the crystal growing, the bubble inclusions （are）form（ed）. While （when）a lower rotation rate is applied, gas bubbles move（ to the删掉） upper（删掉 part） and diffuse （删掉 go) out of the melt(删掉 due to the diffuseion ） . So a lower rotation is effective to suppress （删掉the formation of） bubble inclusion. It can be also found that there is no low-angle grain boundary in the crystal grown at lower rotation rate.
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