When an atom shoots out a photon of light, it recoils like a gun.
原子发出光子时，会象枪一样地反冲。
When an atom loses one or more electrons it acquires a positive charge and is known as a cation.
当原子失去一个或多个电子时，它就带正电荷并被称之为阳离子。
When an atom loses one or more electrons it acquires a positive charge and is known as a cation.
当原子失去一个或多个电子时，它就带正电荷并被称之为阳离子。
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