Cities are the "soil" of the tertiary industry, and the tertiary industry is the "seedlings" in the "soil". Without the corresponding development of the city, the "seedlings" will not be nourished and cannot thrive. visible? ['Slow urbanization, the tertiary industry cannot develop.', "With the increasing proportion of the tertiary industry in the gross national product, China's cities have developed rapidly.", 'The tertiary industry effectively supports and supplements the primary and secondary industries.', 'In China, the tertiary industry has solved the employment problems of a large number of laid-off workers and social idle workers.']