求翻译：20世纪70年代中期以来，以Johanson和Vahine 为代表的北欧学派(1990)使用企业行为理论研究方法，提出了企业国际化阶段论，开创了企业国际化理论研究的先河。是什么意思？

Since the mid-1970s, as the representative of johanson and vahine, the Nordic School (1990) theoretical approaches of corporate behavior, enterprise internationalization stage theory, creating a precedent for the theoretical study of enterprise internationalization.

Century 20 since the mid 70s to Johanson Vahine and represented in the Nordic countries with school (1990) behavior of enterprises by theory, research methods in business internationalization stage theory, pioneered the theoretical study of the international business.

Since the 20th century 70's intermediate stages, take Johanson and Vahine as representative's Northern Europe school of thought (1990) use enterprise behavior fundamental research methods, proposed the enterprise internationalization stage theory, founded the enterprise internationalization fundamen

In the mid 1970 of the 20th century, the Nordic school represented by Johanson and Vahine (1990) research methods of using a behavioral theory of the firm, make enterprise internationalization stages theory, pioneered research on enterprise internationalization theory of precedent.

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