blue flax

例句：

1. 1. The sky is a deep shade of blue today.
   今天的天空是深蓝色。
2. 2. Her eyes were a bright blue.
   她的眼睛是明亮的蓝色。
3. 3.This dress is made of blue silk.
   这件衣服是用蓝色的丝绸做的。