characteristics 加s的是名词，可数，如：Good planning is one of the characteristics of a successful business.
characteristic 是形容词，如：It's characteristic of her that she never complained.
characteristics
规格参数表;特征;特性
characteristic 特有的, 典型的
来自希腊语 charakter 雕刻
只有在术语中才有区别的
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