English sentence:

(1) I am fond of people who are grateful deep down in the heart and people who travel to a distant place all alone. 

(2) The most beautiful meeting is not to say the past; the best separation is not to ask the date of return.

3.  Exchange Data with ROS Publishers and Subscribers

(https://ww2.mathworks.cn/help/robotics/examples/exchange-data-with-ros-publishers-and-subscribers.html)

4.  Work with Basic ROS Messages 

(https://ww2.mathworks.cn/help/robotics/examples/work-with-basic-ros-messages.html）

 5.  Work with Specialized ROS Messages

          （https://ww2.mathworks.cn/help/robotics/examples/work-with-specialized-ros-messages.html）

 6.   For application examples: 

              1.  Get Started with Gazebo and a Simulated TurtleBot

(https://ww2.mathworks.cn/help/robotics/examples/get-started-with-gazebo-and-a-simulated-turtlebot.html)

Download Virtual Machine

http://www.mathworks.com/robotics/v3/ros_vm_install

             Platform-Specific Installation Instructions

Linux (64-bit)

Download theVMware® Player softwarebundle (license)

Install VMware Player by executing the bundle installer with administrative privileges

Download thearchivecontaining the virtual machine

Decompress the archive to a location on your hard drive

Start VMware Player

In VMware Player, pressOpen a Virtual Machine

Browse to the location of the Ubuntu image, selectROS Indigo Gazebo v3and pressOK

The virtual machine is now added to your library

In VMware Player, start the virtual machine

PressI copied itif a window opens that asks if you copied or moved the virtual machine

             2.  Virtual Machine with ROS Indigo and Gazebo for Robotics System Toolbox™

(https://www.mathworks.com/supportfiles/robotics/ros/virtual_machines/v3/installation_instructions.htm)

             3.  Get Started with a Real TurtleBot

(https://ww2.mathworks.cn/help/robotics/examples/get-started-with-a-real-turtlebot.html)

4.  Read Model and Simulation Properties from Gazebo

(https://ww2.mathworks.cn/help/robotics/examples/read-model-and-simulation-properties-from-gazebo.html)

             5.  Add, Build, and Remove Objects in Gazebo

(https://ww2.mathworks.cn/help/robotics/examples/add-build-and-remove-objects-in-gazebo.html)

             6.  Apply Forces and Torques in Gazebo

(https://ww2.mathworks.cn/help/robotics/examples/apply-forces-and-torques-in-gazebo.html)

             7. Test Robot Autonomy in Simulation

(https://ww2.mathworks.cn/help/robotics/examples/test-robot-autonomy-in-simulation.html)

             8. Communicate with the TurtleBot

(https://ww2.mathworks.cn/help/robotics/examples/communicate-with-the-turtlebot.html)

             9. Explore Basic Behavior of the TurtleBot

(https://ww2.mathworks.cn/help/robotics/examples/explore-basic-behavior-of-the-turtlebot.html)

             10. Control the TurtleBot with Teleoperation

(https://ww2.mathworks.cn/help/robotics/examples/control-the-turtlebot-with-teleoperation.html)

             11. Obstacle Avoidance Using TurtleBot

(https://ww2.mathworks.cn/help/robotics/examples/obstacle-avoidance-using-turtlebot.html)

             12. Track and Follow an Object

(https://ww2.mathworks.cn/help/robotics/examples/track-and-follow-an-object.html)