new BottomNavigationBarItem(icon:新图标(Icons.)color . fromrgbo (79, 119,45,1): color . fromrgbo (236, 243,158,1))，title: new Container(height: 0.0)，
它将是label，因为title已被弃用。
点击链接:https://docs.flutter.dev/release/breaking-changes/bottom-navigation-title-to-label
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