Crystals may be insulators, semiconductors, or conductors.

晶体可以是绝缘体，半导体，或导体。

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That distinguishes them from synchronous motors that use a permanent magnet in their rotors instead of a set of aluminium or copper conductors.

这就把它们和在转子处使用永磁铁而非一套铝或铜导体的同步发动机区分开来。

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Different conductors engage these skills in different ways, and may in fact help or hinder this process.

不同的指挥用不同的方式衔接这些技巧，并可能在事实上帮助或者阻碍这一过程。

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Labour's Hugh Henry brought the backbench bill, saying employees such as shop-workers or train and bus conductors needed extra protection.

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There have been no reports or observations of externalized conductors in these newer Optim-insulated leads, out of over 65, 000 of these leads sold worldwide since 2008.

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"Usually, it's a note here or there or a missing dynamic indication, which will be weeded out by conductors, musicians, librarians or musicologists, " says Mr. Orenstein, a Ravel scholar of 45 years and the author of "A Ravel Reader" (1990).

WSJ: Ravel| Mother Goose| New York Philharmonic| Arbie Orenstein