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？
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。
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。
If you bounce the flash off a wall to the side of you, or behind you, then the source of light relative to the subject, is much larger than if you had shot with the flash straight on.
如果你把闪光灯打到你旁边或身后的墙上，相对于拍摄主体来说，此时的光源面积要比直接将闪灯打到主体上要大的多。
If you bounce the flash off a wall to the side of you, or behind you, then the source of light relative to the subject, is much larger than if you had shot with the flash straight on.
如果你把闪光灯打到你旁边或身后的墙上，相对于拍摄主体来说，此时的光源面积要比直接将闪灯打到主体上要大的多。
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