a.

1. 周遭的；环绕的
   Because the use of flash is banned in a football game, the audience can only use the ambient light to take pictures.

   因为在足球比赛时不准使用闪光灯，观众只能用周围环境条件的灯光拍照。

adj.

1. relating to the immediate surroundings of something.
2. denoting a style of electronic instrumental music with no persistent beat, used to create a relaxed atmosphere.