a.

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

   因為在足球比賽時不准使用閃光燈，觀眾只能用周圍環境條件的燈光拍照。

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.