slope of isochron

例句：

1. 1. The research team discovered a new type of isotopes in the ocean.
   研究小组在海洋中发现了一种新的同位素。
2. 2. The scientists are studying the isotopes of carbon and nitrogen to understand the Earth's formation.
   科学家们正在研究碳和氮的同位素，以了解地球的形成。
3. 3. The isotopes were used to create a unique material that could be used in electronic devices.
   这些同位素被用来制造一种独特的材料，可以用于电子设备。