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电子是一种微观粒子,在原子如此小的空间内围绕原子核作高速运动,并且其运动与宏观物体运动不同,没有确定的方向和轨迹,只能用电子云描述它在原子核外
Electron is a kind of microscopic particle. It moves at high speed around atomic nucleus in such a small space, and its movement is different from that of macroscopic object. There is no definite direction and trajectory. It can only be described by electron cloud outside the nucleus