Jīngcháng duànliàn néng zēngqiáng dǐkànglì.
Regular exercise can strengthen one's immunity.
Lǎorén hé értóng de dǐkànglì jiào ruò, gèng róngyì gǎnmào.
The elderly and children have weaker immunity and are more prone to colds.
Yālì guò dà huì jiàngdī réntǐ de dǐkànglì.
Excessive stress can lower the body's resistance.
