blue ground

例句：

1. 1. The sky is a deepshade of blue today.
   今天的天空是深蓝色。
2. 2. She wore a blue dress to thewedding.
   她穿着一件蓝色连衣裙参加了婚礼。
3. 3.The ocean is a beautiful shade of blue.
   海洋是一种美丽的蓝色。