学生们正在实验室里做化学实验。

Xuéshēngmen zhèngzài shíyànshì lǐ zuò huàxué shíyàn.

The students are doing a chemistry experiment in the laboratory.

我们需要通过实验来验证这个假设。

Wǒmen xūyào tōngguò shíyàn lái yànzhèng zhège jiǎshè.

We need to verify this hypothesis through experiments.

他花了三个月实验新的教学方法。

Tā huāle sān gè yuè shíyàn xīn de jiàoxué fāngfǎ.

He spent three months experimenting with new teaching methods.