http://www.adobe.com/devnet/flash/learning_guide/animation/part01.html

From this reading---just a little note remind myself:))))))

I learn 1)Shape Hint   2) Motion Path  3)Inverse kinematics (IK)

The Bone tool is extremely amazing!!!!!! I am shock!! (http://www.adobe.com/devnet/flash/articles/concept_bone_tool.html)
To adjust the number of Strength and Damping, i can change the movement of a string. WOW(@o@)