To say that the majority of people in the United States have some sort of tie with an ethnic background from a different country would be a safe assumption.
种族背景与成为美国人毫不相干。如果说大多数美国人都来自不同国家，有不同的种族背景，这种假设肯定成立。
In this film, Kato is a martial arts expert. Do people make the assumption that you have a background in martial arts?
电影里的加藤是个武术方面的专家，有人问过你有没有武术的功底吗？
Traditional methods of signal detection and estimation were based on the assumption that the background noise is white.
传统的信号检测和估计方法一般是建立在背景噪声是白噪声这一假设基础之上。
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