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There exist neither perfect insulators nor perfect conductors .

既没有理想的绝缘体，也没有理想的导体。

Support insulators must be taken to a reprocessing plant .

支柱绝缘子必须送到再生工厂。

Take note of the diagonal arrangement of the runners in asymmetrical lightweight section insulators .

注意非对称轻质分段绝缘器的对角线设置。

Conductors and insulators are of great use in industry as well as in our daily life .

导体和绝缘体不仅在我们日常生活中，而且在工业上用处都很大。

But for the crystal to do its job , those elements must also be electrical insulators .

但是，要用晶体来完成任务的话，那些成分就必须也是电子绝缘体。