a well-defined track or path的用法和样例：
- In most cases the boolean operations are applied against solid , or closed, mesh objects with a well defined interior and exterior surface.
- A raised bank or path, such as one along a canal.
- First, is everyone on the team driving toward a well defined and articulative objective?
- The hocks are short to the feet, turning neither in nor out, with a well defined hock joint.
- Each task should result in a well defined deliverable.That deliverable needs to be verified that it is truly complete.