deuterium

例句：

1. 1.The atomic clock relies on the precise measurement of deuterium and protium atoms.
   原子钟依赖于对氘和氚原子精确测量。
2. 2. Deuterium isotope has been used in nuclear reactors to improve efficiency.
   氘同位素在核反应堆中被用来提高效率。
3. 3.The study of deuterium isotope helps us understand the behavior of heavy elements in the universe.
   研究氘同位素有助于我们理解宇宙中重元素的行为。