英文：An electrode used in certain electron tubes to provide secondary emission.
中文：中間極，二次發射電極一種用于一定電子管作第二次發射電極
英文：The number of electron pairs an atom can share with other atoms.
中文：共用電子對數，共價一個原子與其他原子共用的電子的對數
英文：A particle, such as an electron, a proton, or a neutron, having half-integral spin and obeying statistical rules requiring that not more than one in a set of identical particles may occupy a particular quantum state.
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