The plasma flows in a loop along a magnetic field line.

这些等离子体沿着磁力线的方向流动喷发。

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At the solar surface, convective motions of heated gases jostle the magnetic field line.

在太阳表面，炽热气体的对流运动把这根磁力线冲来撞去。

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Sleep direction of the magnetic field line, in the magnetic field under the action of blood running smoothly.

睡眠方向顺应了磁力线，在磁场力的作用下，气血运行畅通。

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And he found line splitting in the magnetic field.

他发现光谱线在磁场中分裂了。

麻省理工公开课 - 固态化学导论课程节选

And when a magnetic field line vibrates, he says, it makes an electric field which excites current in wires.

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The system detects any change in the magnetic field on or behind the goal line to determine if a goal has been scored and alerts the ref.

CNN: Over the line: Goal tech to be used at 2014 World Cup

GoalRef, meanwhile, uses a magnetic field and a special ball to determine whether a ball has completely crossed the line or not.

CNN: Goal-line technology enters final testing