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TOEFL BNC: 6303 COCA: 10273

an atom or small group of atoms that has an electrical charge because it has added or lost one or more electrons离子

See also
-ionsuffixuk/ -ən/ us/ -ən/ also -ation, also -ition

added to verbs to form nouns showing action or condition(加在动词后构成名词表示“行为,状态”)

obsession着魔
restoration恢复
repetition重复

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