\input and \include are different in Latex

http://www.ics.mq.edu.au/~rdale/resources/writingnotes/latexstruct.html

\documentstyle{...}
...
\includeonly{secondfile}
...
\begin{document}
\include{firstfile}
\include{secondfile}
...
\include{lastfile}
\end{document}
This tells LaTeX to consult the aux files corresponding to each included file, but only to actually include the text of the files listed in the \includeonly line. Because LaTeX looks at the other aux files, it knows about section and page numbers, cross-references, and so on. This means that the output will start at the appropriate page for the text in secondfile.tex, with appropriate section numbers and so on. Simply by changing the \includeonly line and reformatting, you can get different parts of the entire document printed, with all the numbering being that which you would get had you printed the entire document.
One potential disadvantage of this method is that, unlike \input, each included file will automatically begin on a new page

offense wins the game

Attack, attack and smart attack

tips on ping pong 2

When the ball is spinning, use force to counter the spin.

hints on ping pong

1. Why cannot I return the ball when the opponent uses force?
Because the ball is fast, you cannot give enough force to the ball when the ball hits your paddle. The easiest way to return the ball is to use force upward a little bit so that the ball will not hit the net.

2. Why should I change the point where I hit the ball when I loop?
When the incomming ball is backspinning, you need to counter the backspinning. So you should hit the ball's middle side. When the incomming ball is topspinning, you need to counter the topspinning and hit the ball's top side. When the opponent returns your loop, you should hit the ball's top side since the ball is not backspinning in general.

3. Return the close-net backspinning ball: 搓或挑 - using different slope according to the height of the ball

4. Return the close-net topspinning ball: 推或拨 - cover the ball and use force forward

5. Return the far-net backspinning ball: loop - use force upward and hit the ball's side

6. Return the far-net topspinning ball: loop - use force forward and upward and hit the ball's top side

7. Not too dark: for new baby like me, don't try to be too dark: wanting to hit the ball back just over the edge of the table. Be robust.