methionine

例句：

1. 1.The amino acid methionine is essential for the body's growth and development.
   甲硫氨酸是身体生长和发育所必需的氨基酸。
2. 2. In protein synthesis, methionine is used to build the amino acids that make up proteins.
   在蛋白质合成过程中，甲硫氨酸被用来构建构成蛋白质的氨基酸。
3. 3. Methionine is also an important source of energy for athletes, who need it to maintain their performance during intense training sessions.
   甲硫氨酸也是运动员的重要能量来源，他们需要它来在高强度训练期间保持表现。