氦化学元素

例句：

1. 1. Helium is a noble gas that is used in balloons and rockets.
   氦是一种稀有气体，用于气球和火箭。
2. 2. The helium-neon laser is a powerful light source that can be used for surgery.
   氦氖激光器是一种强大的光源，可用于手术。
3. 3. Helium is a rare gas that has no color or smell, making it ideal for use in scientific experiments.
   氦是一种稀有气体，没有颜色或气味，因此非常适合用于科学实验。