in-the-canal hearing aid

例句：

1. 1. The in-the-canal hearing aid helps people with visualimpairments to hear better.
   这种盲道助听器帮助有视觉障碍的人听得更好。
2. 2.She bought an in-the-canal hearing aid for her father, hopingit would improve his hearing.
   她给父亲买了一个盲道助听器，希望它能改善他的听力。
3. 3. Thein-the-canal hearing aid is a smalldevice that plugs into the earcanal and transmits sound waves tothe inner ear.
   盲道助听器是一种小型设备，插入耳道中，将声波传输到内耳。