flutter引入外部包出錯 A dependency may only have one source.

在使用Flutter的時候添加依賴報錯了 Error on line 34, column 5 of pubspec.yaml: A dependency may only have one source. ╷ 34 │ ┌ sdk: flutter 35 │ │ 36 │ │ cupertino_icons: ^0.1.0 37 │ │ english_words: ^3.1.0 38 │ │

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