purple convex lens

例句：

1. 1.The sky was a deep shade of purple as the sun set.
   太阳落山时，天空是深紫色的。
2. 2.She wore a purple dress for her wedding.
   她穿着一件紫色的婚纱参加婚礼。
3. 3.The purple flowers in the garden are very beautiful.
   花园里的紫色花朵非常美丽。