English: listening、speaking、reading、writing、translation

1. Do you drink a lot of water?

Well, I would like to think myself as a person who drinks a lot of water, but that is not true. Sometimes I got so busy. Sometimes I got occupied that I forgot to drink liquid at all. And when I do remember to drink something, I would usually choose beverages, you know, things like juice and Coca-Cola. I know it is not very healthy for me but who can resist? A Coca-Cola tastes so good!

2. When you are keen on me, I am not fond of you in an opposite manner. When you have affection for me, I have a liking for you. Only when you leave me do I start to fall in love with you. Is it that you go too fast or just that I can’t catch up with you?

3. When you realize you want to spend the rest of your life with somebody, you want the rest of your life to start as soon as possible. 

4. "One is always on a strange road, watching strange scenery and listening to strange music. Then one day, you will find that the things you try hard to forget are already gone.

5. Success is not final, failure is not fatal, it is the courage to continue that counts.

6. There is nothing impossible to him who will try.  

7. When you like a person, the world is a love letter.

8. To feel the flame of dreaming and to feel the moment of dancing,when all the romance is far away,the eternity is always there.

9. Not all the people in your life are meant to stay.

10. You can finish the longest road step by step. But you may be unable to finish the shortest road if you have no action of striding. 

ros

Creating a workspace for catkin (http://wiki.ros.org/catkin/Tutorials/create_a_workspace)

source /opt/ros/melodic/setup.bash

$ mkdir -p ~/catkin_ws/src
$ cd ~/catkin_ws/
$ catkin_make

1. Writing a Simple Publisher and Subscriber (C++)

   This tutorial covers how to write a publisher and subscriber node in C++.

2. Writing a Simple Publisher and Subscriber (Python)

   This tutorial covers how to write a publisher and subscriber node in python.

3. Examining the Simple Publisher and Subscriber

   This tutorial examines running the simple publisher and subscriber.

4. Writing a Simple Service and Client (C++)

   This tutorial covers how to write a service and client node in C++.

5. Writing a Simple Service and Client (Python)

   This tutorial covers how to write a service and client node in python.

6. Examining the Simple Service and Client

   This tutorial examines running the simple service and client.

7. Recording and playing back data

   This tutorial will teach you how to record data from a running ROS system into a .bag file, and then to play back the data to produce similar behavior in a running system.

8. Getting started with roswtf

   Basic introduction to the roswtf tool.

9. Navigating the ROS wiki

   This tutorial discusses the layout of the ROS wiki (ros.org) and talks about how to find what you want to know.

10. Where Next?

    This tutorial discusses options for getting to know more about using ROS on real or simulated robots.

rospy Overview Initialization and Shutdown （http://wiki.ros.org/rospy/Overview/Initialization%20and%20Shutdown#Initializing_your_ROS_Node）