“氦”造句

氦是一种非常轻的气体。
Helium is a very light gas.

氦是一种用于气球的气体.
Helium is a gas used in balloons.

与氦 - 4不同之处是, 氦-3不能由放射性衰变产生.
Unlike helium - 4, it cannot be produced by radioactive decay.

• #氦