再三(zài sān) or means "repeatedly" or "time and again", and can be placed before or after a verb.

Basic Structure

再三 is interesting because it can be placed before or after the verb!

再三 + verb

verb + 再三

Examples

lǎoshī xiànɡ tā zàisān qiánɡdiào “wàiɡuó” bú shì yī ɡè ɡuójiā。
老师 向 他 再三 强调 “外国” 不 是 一 个 国家。
The teacher has stressed to him over and over that "foreign" is not a country.

zhōnɡɡuó zhènɡfǔ zàisān jǐnɡɡào měiɡuó búyào ɡānshè zhōnɡɡuó de nèizhènɡ。
中国 政府 再三 警告 美国 不要 干涉 中国 的 内政。
China's government warns America repeatedly not to interfere in China's affairs.

tā zàisān yóuyù zhīhòu，zhōnɡyú xuǎnzé zhuāzhù shíjī！
她 再三 犹豫 之后，终于 选择 抓住 时机！
After hesitating again and again, she finally decided to seize the opportunity.

一再 can also be used to convey the same meaning but can only be placed before the verb:

xiǎowánɡ yízài chídào.
小王 一再 迟到。
Little Wang comes late repeatedly.

tā yízài bàoyuàn tā yùnqi hěnchà.
他 一再 抱怨 他 运气 很差。
He complains again and again about his bad luck.