blue phone line

例句：

1. 1. Thesky was a deep shade of blue.
   天空是深蓝色。
2. 2. She wore a blue dressto the wedding.
   她穿着一件蓝色连衣裙参加了婚礼。
3. 3. The ocean is often described asa deep blue sea.
   海洋通常被描述为深蓝色的大海。