异构体

例句：

1. 1. The scientists are studying the isotopes of carbon and hydrogen in the atmosphere.
   科学家们正在研究大气中碳和氢的同位素。
2. 2. The molecules have different isomers with different properties.
   这些分子有不同的异构体，具有不同的属性。
3. 3. The researchers discovered a new isomer of the drug that could be used to treat cancer.
   研究人员发现了一种新异构的药物，可以用于治疗癌症。