Collabtive的核心理念：每个项目是由若干个任务列表组成的，而每个任务列表又由若干具体任务组成。这样一级一级的细分，可以使我们的项目趋于合理明晰化，充分明确项目组每个成员的职责和任务。-Collabtive s core philosophy: each project is composed of a number of tasks list, and each task list consists of a number of specific tasks. This level