The author discusses the development of the foreign theories of labor migration.Accordingly the history includes 3 phases:before the 2 nd World War,from the 2 nd World War to 1980 and from 1980 on.
The paper discusses the meaning and extension of food supply security, forwards the rules to choose indicators, established a set of indicators and comprehensively evaluates and measures indexes of food security.
文摘The author discusses the development of the foreign theories of labor migration.Accordingly the history includes 3 phases:before the 2 nd World War,from the 2 nd World War to 1980 and from 1980 on.
文摘The paper discusses the meaning and extension of food supply security, forwards the rules to choose indicators, established a set of indicators and comprehensively evaluates and measures indexes of food security.
