A witness to an automobile accident was testifying.

有一名车祸目击证人正在出庭作证。

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I have also been an expert witness at a tragic accident when a belay failed.

我也一直是确保失败这种悲惨意外发生时的作证专家。

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When a number of people witness something such as an accident, the more people that are present the less likely it is that someone will step forward to help.

当有一堆人见证事故发生时，越多人在场，越少人会上前提供帮助。

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Nobody can doubt the perilous verve of the opening, in which Joe (Daniel Craig) and his girlfriend, Claire (Samantha Morton), witness a fatal balloon accident in an English field.

NEWYORKER: Enduring Love