Structural unemployment refers to changes in the economic structure of rain (including industrial structure, product structure, and regional structure). The existing labor force, skills, concepts, and regional distribution do not adapt to this change and do not match market demand. Unemployment triggered. According to the above definition, Which of the following are structural unemployment. ['Xiao Wang was "unemployed" immediately after graduating from college because his major was cold.', 'Aunt Zhang, who is not literate, does not meet the requirements of modernization and is unemployed.', "Xiao Li always runs into a wall when looking for a job because he doesn't have a Certificate in College English.", 'A company in Shanghai lacks senior workers and there is a vacancy in talent.']