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构建环境
flutter --version
Flutter 1.19.0-2.0.pre.142 • channel master • https://github.com/flutter/flutter.git
Framework • revision 721927efd3 (27 hours ago) • 2020-05-21 17:52:02 -0700
Engine • revision 9ce1e5c5c7
Tools • Dart 2.9.0 (build 2.9.0-10.0.dev 7706afbcf5)
