晶体的靠近表面的区域缺陷较密集，中心部分较少。
The density of crystal defects in the region near the crystal surface is greater than that in the center.
坩锅底部采用了导热性良好的陶瓷棒作支座，以增强晶体中心部位的散热。
A ceramic rod with favorable heat conductivity is arranged on the bottom of a crucible to be used as a support seat to enhance the heat dissipation of the central position of crystal.
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