For example, most in-ear hearing aids are made this way, because each piece must be custom-fit to each patient's ear canal.
For example, most in-ear hearing aids are made this way, because each piece must be custom-fit to each patient's ear canal.
举例来说，耳内助听器目前多半就是用这种方式制造，因为每具助听器都必须依据客户的耳道量身订做。