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我試圖訪問鍵下面的解釋:拿到鑰匙值在斯威夫特一個複雜的嵌套字典/陣列組合
let dictionaryToUSe = ["Starter":["mealName":"hamburger","price":"20.00"],"MainCourse":["mealName":"hotdog","price":"30.00"] ]
let keysToUse = dictionaryToUSe.keys
print(keysToUse) // returns "LazyMapCollection<Dictionary<String, Dictionary<String, String>>, String>(_base: ["Starter": ["price": "20.00", "mealName": "hamburger"]], _transform: (Function))\n"
如何訪問「啓動器」串? 以及如何生成「dictionaryToUSe」字典的鍵列表?