The results show that posterior height of vertebral body, Upper antero-posterior diameter of vertebral body and total breadth, all are positive allometry;
结果表明，椎体后高、椎体上矢径、全宽呈正异速生长；
But the lessening of virtual breadth of the annular electrode makes the radial distribution of plasma density more unequal, and the total density and the average temperature lower.
但环电极有效宽度的减小使得等离子体密度的分布更不均匀，并使总的密度和平均温度均下降。
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