after "roslaunch turtlebot3_social default.launch", The gazebo and rviz not run, and no error.

[panzhangchao]

process[master]: started with pid [31193]
ROS_MASTER_URI=http://localhost:11311

setting /run_id to 36417c1c-3834-11eb-b3ba-3cf862ce8e2f
process[rosout-1]: started with pid [31207]
started core service [/rosout]
process[create_world-2]: started with pid [31227]
process[tfped2defaultworld-3]: started with pid [31232]
process[gazebo-4]: started with pid [31233]
[create_world-2] process has finished cleanly
log file: /home/pzc/.ros/log/36417c1c-3834-11eb-b3ba-3cf862ce8e2f/create_world-2*.log
[ INFO] [1607308248.198177438]: Finished loading Gazebo ROS API Plugin.
[ INFO] [1607308248.198784815]: waitForService: Service [/gazebo/set_physics_properties] has not been advertised, waiting...
[ INFO] [1607308249.689958644, 0.021000000]: waitForService: Service [/gazebo/set_physics_properties] is now available.
[ INFO] [1607308249.738404240, 0.034000000]: Physics dynamic reconfigure ready.

The terminal stays in this interface all the time.
when I rosrun rqt_graph, there have gazebo, /tfped2defaultworld, gazebo/model_state node.