So a positive attitude can increase levels of nitric oxide, which help to balance neurotransmitters, improve immunity, and increase circulation, she says.

她说，所以积极的态度能够增强一氧化氮的水平，一氧化氮能够帮助平衡神经递质，提高免疫力和增加循环。

youdao

Enhance physical fitness, improve immunity.

增强体质、提高免疫力。

youdao

Objective To improve immunity of KM murine against virulent RH strain of Toxoplasma, to extend its duration of life and provide model for related research.

目的提高昆明鼠抗弓形虫强毒株（RH株）的免疫力，延长其生存时间，为进行相关实验研究提供动物模型。

youdao

As the tea ferments, some believe it creates a variety of health-boosting acids and enzymes that can aid digestion and improve immunity.

WSJ: High Tea Has a New Meaning

Yogurts say they will improve immunity and digestion.

FORBES: Magazine Article