normal function

相關句子：

1. Being a substance that is required for normal functioning but does not need to be included in the diet because of the body's ability to synthesize it from other nutrients.
   (胺基酸)非必需的是正常的運轉所需要的物質的，但因為機體有從其它營養成分合成它的能力，因此不需要被包括在日常的食物中的
2. Being in accord with or characteristic of the normal functioning of a living organism.
   生理的，生理機能的，生理上正常的根據有生命的有機體正常功能的，或具有此特徵的