摘要
The tone of the trip was bittersweet,however.In another classroom,she taught a group of students English when their teacher didn’t show up for class.Pupils,she noticed,are often left by themselves.In some schools,teachers didn’t know why the group was there-a few thought they had come to sell water.In other instances,they were only allowed to leave the filtration equipment with hope that the teachers would use their instructions to teach about the new device.
