In the PBL class, we walked all the way to the Gongguan Night Market to find the bamboo stick recycling bin that we had placed there. This was a collaboration achieved through students' independent contact with the vendors and explaining our desire to recycle the bamboo sticks. When we arrived at the vendor's booth, we found the recycling bin and discovered that many bamboo sticks had already been collected! This was a significant breakthrough for the students, as they were able to take initiative, work independently, and take practical action, which embodies the essence of learning in PBL.