凹面

例句：

1. 1.The room was filled with the scent offresh flowers.
   房间里充满了新鲜花朵的香味。
2. 2.The ambient noise of traffic outsidemade it hard to concentrate.
   外面的交通噪音使得很难集中注意力。
3. 3. The ambientlight from the street lamps cast awarm glow over the park.
   街灯发出的柔和光线给公园投下了温暖的光辉。