Move children's swing sets and sand boxes away from the woodland edge and place them on a wood chip or mulch type foundation.
将孩子的秋千和沙箱从林地边缘移到木屑或护根类覆盖物的地面上。
The constructor sets the visibility of the JFrame to true, which is not permitted by Swing when running in the application's main thread.
构造器将JFrame的可视度设置为true，当Swing运行在应用程序的主线程上是，这是不被允许的。
The constructor sets the visibility of the JFrame to true, which is not permitted by Swing when running in the application's main thread.
构造器将JFrame的可视度设置为true，当Swing运行在应用程序的主线程上是，这是不被允许的。
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