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Summer vacation is also summer holidays.During this period ，the school prepare for the next academic year. They may do some cleaning and mending work。 teachers can take further education and gain more knowledge. As for students ,they can have a good rest. In some countries ,students may take part in some activities ,such as wummer camps. They may also go out with friends. High school students sometimes visit colleges and unversities. It is also typical for teengers to get a job during the summer vacation ,so that they can get some pocket money. Many parents take time off work and go on a family vacationwith their children during the summer. However,summer vacations in diffent countries are not always the same. In the U ntied States,summer vacation lasts for almost 3 months. Most schools take summer vacation from early June or late May. In Australia, the summer vacation lasts from December th February. In the Netherlands, summer vacation is shorter than anywhere else in Europe. It usually starts in July and lasts for 6 or 7 weeks. In Poland,summer vacation starts on the first Saturday after June 18 and ends on the first weekday of September.