这个小配件的妙处就在于它对于牙医而言十分实惠，而且只要有MP3播放器的病人都能使得益于此，也无需付额外的费用。
The beauty of this gadget is that it would be fairly cost-effective for dentists to buy, and any patient with an MP3 player would be able to benefit from it, at no extra cost.
连安全带这样的小配件也出现了故障。
There were also hitches in the supply of smaller parts such as fasteners.
更加无法想像的，一些为最近的小配件所需要的电力可能是在一个几十年前的发电厂。
More prosaically, some of the electricity for your latest gadget was probably made in a power plant that's decades old.
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