sand martin

例句：

1. 1. The sand martins area common sight in the desert.
   沙雀是沙漠中常见的景象。
2. 2. Thesand martins weresinging their sweet songs in themorning sun.
   沙雀们在早晨的阳光下唱着甜美的歌曲。
3. 3. The sandmartins are known for their brightcolors and graceful flight.
   沙雀以其鲜艳的颜色和优雅的飞行而闻名。