中央研究院人文社会科学研究中心。

Center for Survey Research, Academia Sinica.

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北京思源社会科学研究中心据历年《中国统计年鉴》及《中国工业经济统计年鉴》制表。

Made by Beijing Siyuan Consultancy according to Chinese Sta. Almanac& Sta. Almanac of Chinese Industrial Economy in years past.

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就此，柏林社会科学研究中心的学者路得•科普曼斯表示：“对德国产生认同感固然重要，但更为重要是移民使用德语，与德国本土人交往。”

“Speaking the language and having contacts with Germans is more important than feeling German,” says Ruud Koopmans of the Social Science Research Centre in Berlin.

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