ambient

1. ADJ The ambient temperature is the temperature of the air above the ground in a particular place. 环境的[技术] [ADJ n]

2. ADJ Ambient sound or light is the sound or light which is all around you. (声音或光线)环绕的[技术] [usu ADJ n]

...ambient sounds of children in the background. ...背景处环绕着孩子们的声音。