The ultrasonic "seeing eyes," for instance, emit a beep when the carrier approaches an obstacle. After trying them out, it was realized that they were not appropriate for Taiwan because they began beeping non-stop as soon as they were taken out the door. Carrying one was worse than having nothing at all.
遇到障礙物會發出「嗶嗶」聲響的超音波導盲器，經過試用，確定在台灣不適合，因為一出門就響個不停，比不帶還糟糕。