抗力

nǐ yào zēng qiáng duì gǎn mào de kàng lì

你要增强对感冒的抗力。

You need to build up your resistance to colds.

yòu shí shǐ tā duì jí bìng de kàng lì jiǎn ruò

幼食使他对疾病的抗力减弱。

A poor diet has lowered his resistance to illness.