pterocarpin

例句：

1. 1. The pterocaripin is a rare and valuable species of bird.
   这种鸟是稀有而珍贵的物种。
2. 2. The pterocaripin has a unique ability to fly in the air.
   这种鸟具有在空中飞行的独特能力。
3. 3. The pterocaripin is protected by law because it is a vulnerable species.
   这种鸟受到法律保护，因为它是一种易受伤害的物种。