helium
Helium is a very light gas.
氦是一种非常轻的气体。
—— 柯林斯例句Helium is a gas used in balloons.
氦是一种用于气球的气体。
—— 给力词典精选Unlike helium - 4, it cannot be produced by radioactive decay.
与氦 - 4不同之处是, 氦-3不能由放射性衰变产生。
—— 给力词典精选The helium - 3 apparently became trapped when the earth was formed.
显然,当地球形成时,氦 - 3就被圈闭了。
—— 给力词典精选After hydrogen, the atom with the simplest structure is that of helium.
在氢元素之后, 氦的原子结构最简单。
—— 辞典例句