isobase

例句：

1. 1. The isotopes are used to study the properties of matter.
   同位素用于研究物质的性质。
2. 2.The isotopes were used to create a new material with unique properties.
   同位素被用来创造具有独特性质的新材料。
3. 3. The isotopes have been studied for their potential applications in medicine.
   同位素已被研究用于其在医学上的潜在应用。