tetrahydrobiopterin

例句：

1. 1. The enzyme plays a crucial role in the metabolism of fatty acids.
   该酶在脂肪酸代谢中起着关键作用。
2. 2. Biotin is essential for maintaining healthy hair and nails.
   生物素对保持健康的头发和指甲至关重要。
3. 3. The body needs biotin to support normal growth and development.
   身体需要生物素来支持正常的生长和发展。