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单语范例（未经PONS编辑处理）
This random movement of electrons in a straight line is known as drift current.
en.wikipedia.org In the first case, the bond is divided so that each product retains an electron and becomes a neutral radical.
en.wikipedia.org These two motions combined cause an excitation of an electron in a helical motion, which includes translation and rotation and their associated operators.
en.wikipedia.org In the scanning electron microscope, at magnifications of 500 x and above, tiny pits become visible.
en.wikipedia.org Though it is electron deficient compared to carbon, it does not form a metal.
en.wikipedia.org