接下来我想介绍一下弧长。
So, the next concept that I want to define is that of arc length.
在这种情况下，如果在来回运动，第一次增长的弧长更有意义，接着减少，再增长，诸如此类。
But, in this case, if you are moving back and forth, it would make more sense to have the arc length first increase, then decrease, increase again, and so on.
在氩弧下，影响熔池形貌的另一个重要的驱动力是气体剪切力，而氦弧下则是电磁力。
However, the effect of electromagnetic force is stronger than that of the plasma drag force in helium arc.
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