But what if you don't have a wall or other surface to bounce your flash off of?

但是如果没有墙或天花板可用呢？

youdao

The droplets immediately flash off to steam, carrying away tremendous amounts of Btus.

水滴立即闪蒸成蒸汽，带走大量的热量。

youdao

You need a flash unit with a tilt head or the ability to mount the flash off-camera on a flash bracket.

你需要有一个能调节闪光角度的闪光灯，或一个离开相机的闪光灯架。

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What I'll always remember was seeing him, about an hour later, momentarily take off his thick dark rimmed glasses,and announce: "From Dallas,Texas,the flash, apparently official, President Kennedy died at one p.m.

VOA: special.2009.08.16

Around back, the Lumia 720's rear camera module is housed neatly in that familiar metallic strip, which also plays host to the Carl Zeiss branding, with the flash off to the left.

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"I was scared to death when a bright flash went off, " wrote one female user.

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Mike Hussey and Brad Haddin, together at the resumption, have produced some impressive stands thus far in the series - but were parted in the fourth over when a flat-footed flash outside off stump by Haddin gave James Anderson his first wicket of the match.

BBC: Ashes: Alastair Cook builds England reply in Sydney