5 sentences

1. 氢与氧化合生成水。

   qīng yǔ yǎng huà​hé shēng​chéng shuǐ.

   Hydrogen combines with oxygen to form water.

   Source: AI Challenger 2017

2. 最轻的元素是氢。

   zuì qīng de yuán​sù shì qīng.

   The lightest element is hydrogen.

   Source: AI Challenger 2017

3. 首批恒星仅仅含有氢和氦。

   shǒu​pī héng​xīng jǐn​jǐn hán​yǒu qīng hé hài.

   The first stars contained only hydrogen and helium.

   Source: CCMatrix

4. 氢气比空气轻。

   qīng​qì bǐ kōng​qì qīng.

   Hydrogen is lighter than air.

   Source: AI Challenger 2017

5. 恒星是一种宇宙的厨房，里面的氢原子被烹调成较重的原子。

   héng​xīng shì yī​zhǒng yǔ​zhòu de chú​fáng, lǐ​miàn de qīng​yuán​zǐ bèi pēng​tiáo chéng jiào zhòng de yuán​zǐ.

   A star is a kind of cosmic kitchen where atoms of hydrogen are cooked into heavier atoms.

   Source: CCMatrix