I can't. It is stipulated in the official website of Xiamen Marathon that all runners must bring their bracelets into the venue, and they are not allowed to take off their bracelets before the end of the race. So I lost it and couldn't take part in the competition. Marathon is a very popular long-distance race in the world, with a total length of 26 miles and 385 yards, equivalent to 42. 195 km.