helium

名词

1. 1

   氦、氦气

   The balloons were filled with helium so they would float.

   这些气球里灌了氦气，所以会往上飘。

2. 2

   氦化学

   Helium is the second most abundant element in the universe.

   氦是宇宙中含量第二多的元素。