The flash effect is a term in psychology, also known as flash memory, which refers to the phenomenon that individuals easily leave deep and accurate memories of shocking events, and the accuracy of memory does not diminish over time. Events are the most important events related to individuals. According to the above definition, Which of the following are the flash effects:. ['Feng Yu was reading the text when he was in a good mood, and was very impressed by the content of the text.', 'Xiao Wang, who survived the Wenchuan earthquake, still remembers the scene at that time eight years later.', 'The way Gao Yang went to the school when he was a child is still accurately identified when he returns home after a lapse of 40 years.', 'Reunited comrades-in-law who have lost contact for 30 years, many life chores of the year are still vivid.']