而行星的宜居指数（PHI）则考察另外的一组因素，如该星球是否有岩石或冰冻的表面，是否有大气层或磁场的存在。
The PHI looks at a different set of factors, such as whether the world has a rocky or frozen surface, whether it has an atmosphere or a magnetic field.
而行星的宜居指数（PHI）则考察另外的一组因素，如该星球是否有岩石或冰冻的表面，是否有大气层或磁场的存在。
The PHI looks at a different set of factors, such as whether the world has a rocky or frozen surface, whether it has an atmosphere or a magnetic field.
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