The wire snapped at the wall plug with a blue flash.
随着一道蓝色的闪光，墙上插座处的电线啪地一声断了。
《柯林斯英汉双解大词典》
2
The flash is aimed at the ceiling, wall or flash reflector, which disperses and softens the light, and bounces it back at the subject.
闪光时对准天花板，墙面或反光板，使得光线分散和柔化，并反射到被摄物上。
3
You can even Angle your flash up and behind you to fill a small to normal-size room up with beautiful light. Spin it around and up at about 45 degrees to hit the wall and ceiling behind you.