Meaning of kàng:
抗
to resist; to fight; to defy
Wǒmen bìxū yào yīqǐ nǔlì lái kàngjī zhè zhǒng bìng.
我们必须要一起努力来抗击这种病。
We must work together to resist this disease.
Wǒmen yào tuánjié yīzhì, kàngjī kùnnán.
我们要团结一致,抗击困难。
We must unite and fight against difficulties.
Tā juédìng duì cǐ shì biǎoshì kàng yì.
他决定对此事表示抗议。
He decided to protest against this matter.
anti-
Zhè zhǒng yàowù jùyǒu hěn qiáng de dǐ kàng jūn zuòyòng.
这种药物具有很强的抵抗菌作用。
This medication has a strong antibacterial effect.