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报错text.text = message;行
NullReferenceException: Object reference not set to an instance of an object
Message.showMessage (System.String message) (at Assets/Scripts/Message.cs:17)以及 Message._instance.showMessage("修炼时间还剩下" + timer + "秒!");
training.OnTriggerEnter (UnityEngine.Collider other) (at Assets/Scripts/training.cs:43)