To try to link the evolution of these species with changes in the environment , Chu Xuelei of the Institute of Geology and Geophysics in Beijing and his colleagues have been looking at carbon isotopes in the Doushantuo rocks .
为了将这些物种的进化与环境的变化联系起来，北京地质和物理研究的所楚学雷和他的同僚们在陡山沱组岩石里看到了碳同位素。
xuelei