而对于工程师和科学家来说，复数却是个司空见惯的概念。
To engineers and scientists, complex numbers are a familiar concept.
带有复数词尾的学科名称、国家等在意义是暗示单数概念，用单数动词。
The United States is country which has advanced science and technology.
带有复数词尾的学科名称、国家等在意义是暗示单数概念，用单数动词。
The United States is country which has advanced science and technology.
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