有理

yǒu lǐ zǒu biàn tiān xià

有理走遍天下。

With justice on one's side, one can go anywhere.

wǒ jiǎng de yǒu lǐ

我讲得有理。

What I say is quite reasonable.

tā de huà tīng qǐ lai sì hū yǒu lǐ shì shí shang yě shì cuò de

他的话听起来似乎有理，事实上也是错的。

What he says sounds reasonable, but actually it's also wrong.

zhè shì yǒu lǐ fēn shù

这是有理分数。

This is rational fraction.