When a charged particle zips through the chamber, the vapour condenses into a trail of droplets showing the particle's path and, if the box is placed in a magnetic field, its electrical charge.

当一个带电粒子快速穿越云室时，水汽会凝结形成一串小液滴，这样便标识出了该粒子的路径；若将容器置于一个磁场中，还能知道粒子所带电荷的性质。

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Battery Charge and auxiliary REM box functions are integrated.

电池充电和综合副re M盒功能。

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It also offers free delivery and free returns-if you don't like the shoes, you box them up and send them back to Zappos for no charge.

Zappos还提供免费发货和免费退货，就是说如果你不喜欢鞋子，把它们装回鞋盒，不花一分钱就能退回到Zappos。

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Question Box is a service that provides answers free of charge for people who cannot search the Internet directly.

VOA: special.2009.10.12

Porokara, on the edge of the "D", found Moisander free on the left to charge into the box, evade a challenge from James Collins and toe-poke home into the far corner.

BBC: Finland 2-1 Wales

The Panathinaikos centre-back received the ball with no apparent danger around him, but an awful first touch allowed the enterprising Park Ji-sung to steal the ball and charge into the box before sliding a well-placed left-footed strike past the onrushing Tzoras.

BBC: South Korea 2-0 Greece

Eric Hughes, a cryptology expert with Simple Access, an electronic-commerce consulting firm, conducted his own experiment: at a technical conference, he issued a roll of pennies to every participant and explained that there was a one-cent charge, payable into a box beside the door, each time anyone entered the main room.

ECONOMIST: So many ways to pay online