And second, teachers in the program told us that these videos and these surveys from the students were very helpful diagnostic tools, because they pointed to specific places where they can improve.
其次，参与这个项目的老师告诉我们 这些录像以及向学生发放的调查问卷 是非常有用的诊断工具， 因为它们指明了教师们 能够改进的具体环节。