Using simple math deduction results in the focusing conditions of charge-particle flow in the distribution of magnetic fields.
运用较简明的数学推导，给出了在该磁场分布下带电粒子流聚焦的条件。
Using simple math deduction results in the focusing conditions of charge-particle flow in the distribution of magnetic fields.
运用较简明的数学推导，给出了在该磁场分布下带电粒子流聚焦的条件。
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