They're a type of rodent who, who burrow in the ground in the grasslands of the western United States and Mexico.
它们是一种啮齿类动物,在美国西部和墨西哥草原的地上挖洞。
2
They're not always in their groundstates.
它们并不总在基态。
3
Then, a new analytical potential energy function of diatomic molecule is proposed based on the ECM and applied to some electronic groundstates and excited states of diatomic molecules.