pterostigma

例句：

1. 1. The pterostigma is a unique species of bird.
   这种鸟是独特的物种。
2. 2. The pterostigma has a wingspan of over 3 meters.
   这种鸟的翼展超过3米。
3. 3. The pterostigma is known for its ability to fly long distances.
   这种鸟以其长距离飞行的能力而闻名。