phenylalanine

例句：

1. 1.The amino acid phenylalanine is essential for the growth of many plants.
   苯丙氨酸是许多植物生长所必需的氨基酸。
2. 2.In the human body, phenylalanine is converted into other important amino acids.
   在人体中，苯丙氨酸被转化为其他重要的氨基酸。
3. 3. Phenylalanine deficiency can lead to various health problems, including mental retardation.
   苯丙氨酸缺乏可能导致各种健康问题，包括智力发育迟缓。