“The Great Migration of African Americans”的概念、定义、翻译、参考文献-科学参考

单词	The Great Migration of African Americans
释义	The Great Migration of African Americans Encyclopedia 历史学美国历史释 The Great Migration of African Americans黑人大迁徙 1916～1970年约600万非裔美国人从美国南部各州的乡村地区迁徙至东北部、中西部以及西部地区的大规模人口流动。又称北上大迁徙。
随便看	pulse carrier pulse chamber pulse characteristic pulse chart pulse chromatography technique use for catalysis study Pulse Classic pulse clipping pulse code modulation pulse-code modulation pulse code modulation and demodulation pulse code modulation, PCM pulse coherent transponder pulse coincidence measurement pulse compression pulse-compression radar pulse compressor pulse continuously variable transmission pulse control system pulse counter pulse counting pulse-counting photometer pulse current method pulsed pulse damper pulsed dye technique

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