Following narration describes basic imtroduction to the topic. It is possible that you find some alien words the meaning or definition of them you dont know. So, you must have memorised the word list given at the previous page.
The movie requires adobe swf plugin to play. If your system does not have this plugin installed, then a meaasge will appear to install the plugin in the start. You can install it by clicking the link appeared in the page.
How to use controls?
The movie on this page is auto run. The time for each slide is 1 minute. If you are slow reader or you want to read with more concentration, you can pause the slide by clicking the pause button on the bottom left of the movie. For next slide press next button on the right of the pause button.