七月四号是美国独立日，烟火当然必不可少。"Fireworks stands opened for business a week ago," 烟火销售网点一星期前就开张了。 七月四号晚上，最好看的烟火在哪里？"Macy's July 4th fireworks display is the nation's largest fireworks show," ...

So Fireworks 1, 2, and 3 open the first cave (Gloomy Cavern), Fireworks 4, 5, and 6 open the second cave (Waterfall Cavern), and so on. Cave 1 is Gloomy Cavern, Cave 2 is Waterfall Cavern ...