理解下面句子中set短语的意思。 (1)As a traditional way to celebrete the new year, setting off the firecrackers is welcomed by most Chinese people. (2)Try to set aside some time each day for exercise during this period. (3)They want to set up their own import-export business. (4)On arriving there, they set out to do the task. (5)The movie is set in Shanghai in the 1940s.