Scientists discovered that helium is the second lightest element.
科学家发现氦气是第二轻的元素。
The balloon floated higher because it was filled with helium.
这个气球因为充满氦气而飘得更高。
Many party balloons are filled with helium instead of air.
许多派对气球是用氦气而不是空气充满的。
Inhaling helium can temporarily change your voice pitch.
吸入氦气可以暂时改变你的声调。
Stars like the sun produce helium through nuclear fusion.
像太阳这样的恒星通过核聚变产生氦气。
The periodic table lists helium as element number two.
元素周期表将氦气列为第二号元素。
They used helium to cool the superconducting magnets.
他们用氦气来冷却超导磁铁。
Helium is often used in cryogenics and deep-sea diving.
氦气常用于低温学和深海潜水。
The discovery of helium was first made on the sun.
对氦气的发现最初是在太阳上进行的。
They filled the blimp with helium for safety reasons.
出于安全原因，他们用氦气填充飞艇。
helium tank 氦气罐
helium gas 氦气
helium nucleus 氦核
helium atom 氦原子
liquid helium 液态氦
helium isotope 氦同位素
