求翻译：通过声音进行识别需要有丰富的经验。必须经过充分的训练达到能够识别轴承声音与非轴承声音。为此，应尽量由专人来进行这项工作。用听音器或听音棒贴在外壳上可清楚地听到轴承的声音。是什么意思？

Have extensive experience with voice recognition needs. Must undergo full training reach to recognize non-bearing and bearing the sound of voices. To do this, as far as possible to carry out this work by hand. Using the listen or listen to the sound bar attached to the shell can be clearly heard on the bearing of sound.