Hēi cháo shì Tàipíngyáng shàng yītiáo qiángdà de hǎiliú.
The Kuroshio is a powerful ocean current in the Pacific.
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usage
海流 and 洋流 are near-synonyms. In oceanography 洋流 is the standard term (referring to the major basin-scale circulation systems like the Gulf Stream 墨西哥湾流), while 海流 is more general and covers smaller coastal currents too.
