Word: 理论 (lǐlùn)

他提出了一种新理论。

Tā tíchūle yìzhǒng xīn lǐlùn.

He put forward a new theory.

你的理论并没有科学根据。

Nǐ de lǐlùn bìng méiyǒu kēxué gēnjù.

Your theory has no scientific basis.

实验证明了他的理论。

Shíyàn zhèngmíng le tā de lǐlùn.

The experiment confirmed his theory.

我不想听你的理论。

Wǒ bùxiǎng tīng nǐ de lǐlùn.

I don't want to hear your theories.

我在他的理论中找不到任何问题。

Wǒ zài tā de lǐlùn zhōng zhǎo búdào rènhé wèntí.

I can't find a single flaw in his theory.

我的理论是这样。

Wǒ de lǐlùn shì zhèyàng.

That's my theory.

最后，他终于明白了那个理论。

Zuìhòu, tā zhōngyú míngbai le nàge lǐlùn.

At long last, he understood the theory.

然而，相反的理论往往也是真的。

Rán'ér, xiāngfǎn de lǐlùn wǎngwǎng yě shì zhēnde.

And yet, the contrary is always true as well.

理论得联系实际。

Lǐlùn de liánxì shíjì.

Theory and practice should go hand in hand.

科学家的工作就是对理论加以检验。

Kēxuéjiā de gōngzuò jiùshì duì lǐlùn jiāyǐ jiǎnyàn.

The work of a scientist is to put ideas to the test.