diff --git a/sim_scenes/solar_system/speed_of_light_init.py b/sim_scenes/solar_system/speed_of_light_init.py
index ac8f71b5ee0e2b05c7d4bd4a4210f7da29ab1e62..ad54e9df0a43c1c5e5c3e67c92579fafe2e9aaa2 100644
--- a/sim_scenes/solar_system/speed_of_light_init.py
+++ b/sim_scenes/solar_system/speed_of_light_init.py
@@ -29,8 +29,8 @@ class SpeedOfLightInit:
         self.arrived_info = ""
 
         self.__camera_follow_light = camera_follow_light
-        self.light_body = None
-        self.bodies = None
+        self.__light_body = None
+        self.__bodies = None
 
         if self.__camera_follow_light == "SideView":
             # 摄像机位置 = 前-后+、上+下-、左-右+、
@@ -51,6 +51,22 @@ class SpeedOfLightInit:
             self.light_size_scale = 2e3
             self.light_init_position = [AU / 3, 0, 0]
 
+    @property
+    def light_body(self):
+        return self.__light_body
+
+    @light_body.setter
+    def light_body(self, value):
+        self.__light_body = value
+
+    @property
+    def bodies(self):
+        return self.__bodies
+
+    @bodies.setter
+    def bodies(self, value):
+        self.__bodies = value
+
     def on_reset(self):
         """
         点击了重置按钮触发
diff --git a/sim_scenes/ursina_json_sim.py b/sim_scenes/ursina_json_sim.py
index b28c70751f4ef61c28cc3484c5e2e3189b7e1f10..1178b1c1496ea3d988faa4352f28e58ee609f649 100644
--- a/sim_scenes/ursina_json_sim.py
+++ b/sim_scenes/ursina_json_sim.py
@@ -30,8 +30,8 @@ if __name__ == '__main__':
     # bodies, params = Body.build_bodies_from_json('../data/tri_bodies_perfect_05.json')
     # TODO: 去掉注释，引力弹弓的演示
     # bodies, params = Body.build_bodies_from_json('../data/gravity_slingshot.json')
-    # TODO: 去掉注释，引力弹弓的演示2(通过木星、土星加速)
-    bodies, params = Body.build_bodies_from_json('../data/gravity_slingshot_2.json')
+    # # TODO: 去掉注释，引力弹弓的演示2(通过木星、土星加速)
+    # bodies, params = Body.build_bodies_from_json('../data/gravity_slingshot_2.json')
 
     dt = params["dt"] if "dt" in params else SECONDS_PER_YEAR
     position = params["position"] if "position" in params else (0, 0, 0)
@@ -41,4 +41,4 @@ if __name__ == '__main__':
     # 常用快捷键： P：运行和暂停  O：重新开始  I：显示天体轨迹
     # position = 左-右+、上+下-、前+后-
     json_file = None  # 指定 json_file 保存路径，则会将模拟环境天体数据保存到该json文件中
-    ursina_run(bodies, dt, position=position, save_as_json=json_file, show_trail=show_trail)
+    ursina_run(bodies, dt, position=position, save_as_json=json_file,show_timer=True, show_trail=show_trail)