Auto, Red-eye reduction auto, Flash on, Flash off.

自动，强制闪光，禁止闪光，低速同步，防红眼。

At the performer's command, the lights to flash off, then back on.

在魔术表演者的命令下，灯光关闭，之后再打开灯光。

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？

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。

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。