求出了螺旋磁场泵自由电子激光器中含电子相互作用的增益表达式，并进行了讨论。
The effect of electron interaction on gain of a free-electron laser pumped with a helical magnetic field is formulated.
一个螺旋星系产生的磁场遍布各处，但在局部它则把大块的尘埃和气体聚集起来继而产生星体。
A spiral galaxy's magnetic field is global, but it likely ACTS locally to assemble huge clouds of gas and dust that then spawn stars.
当一个带电微粒在磁场中时，它会倾向于沿着磁力线螺旋运动。
When a charged particle is in a magnetic field, it tends to travel along that field's lines of force, spiralling as it goes.
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