鸡蛋富含必需氨基酸，是健康饮食的重要组成部分。

Eggs contain essential ___amino acids, making them an important part of a healthy diet.

健身人士经常在蛋白粉中添加支链氨基酸来促进肌肉修复。

Many bodybuilders add branched-chain ___amino acids to their protein shakes for muscle recovery.

人体需要20种不同的氨基酸来构建蛋白质。

The human body requires 20 different ___amino acids to build proteins.