能播放声音的工具
These tools have sound. Make sure the volume is turned up on your computer.
网络工具的简单案例 (HTML).
An introductory example of the web-based tools. (HTML)
以下网站可取得以上工具 http://plaza.mit.edu/econ
The full site with all the tools: http://plaza.mit.edu/econ
Flash™ 为Macromedia在全世界的注册商标。
Flash™ is a trademark or registered trademark of Macromedia, Inc. in the United States and/or other countries.
