When a charged particle is in a magnetic field, it tends to travel along that field's lines of force, spiralling as it goes.

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。

youdao

In March of that year James Clerk Maxwell, a Scottish physicist, published the first piece of a four-part paper entitled "On physical lines of force".

那一年3月份的时候，一位苏格兰物理学家，詹姆斯·克拉克·麦克斯韦，发表了他论文《论物理的力线(On physical lines of force)》四部分的第一部分。

youdao

In March of that year James Clerk Maxwell, a Scottish physicist (pictured above), published the first piece of a four-part paper entitled "On physical lines of force".

在那一年的三月，詹姆斯·克拉克·麦克斯韦，一个苏格兰物理学家(见上图)，发表了题为《论物理的力线》论文四个部分中的第一个部分。

youdao

In fact for readers of Paradise Lost, and this has been an experience now for a few hundred years, it does often seem as if there were some mysterious life force, a pulsating through Milton's dense and driving lines of unrhymed, iambic pentameter.

实际上，《失乐园》的读者们，几百年来一直都有这种体验，确实，似乎真有一种神秘的生命力，一种脉搏，贯穿在弥尔顿密集，强劲，没有韵律，长短不一的五音步格诗之中。

耶鲁公开课 - 弥尔顿课程节选

In fact, the speech is perhaps the best example of the effective use of repeated lines that gather power and force with each repetition.

FORBES: The Story Behind Martin Luther King's 'I Have a Dream'

The infrastructure that connected these homes to the most basic of services was severed when hurricane-force winds brought trees down across power lines and transformers were fried in a deluge of salt water.

FORBES: It's Time To Upgrade The Entire World's Infrastructure

In a 20-knot breeze the kite is already straining at the 500-pound test control lines with enough force to pull you halfway out of the water.

FORBES: Hook In and Hold On