The duration of work for each student project was carefully planned to ensure adequate time for research and development.
每个学生项目的劳动持续时间都经过精心规划，以确保有足够的时间进行研究和开发。
Teachers need to monitor the duration of work to prevent students from becoming overwhelmed.
教师需要监控劳动持续时间，以防止学生感到不知所措。