isobases

例句：

1. 1. The scientists are studying the isotopes of carbon in the sample.
   科学家们正在研究样本中的碳同位素。
2. 2.The isotopes of uranium have been used in nuclear power plants.
   铀的同位素已被用于核电站。
3. 3.The isotopes of oxygen and hydrogen are found in all living organisms.
   氧和氢的同位素存在于所有生物体内。