Conductors let electricity through, but insulators don't let through.

导体让电流通过, 而绝缘体则不让通过.

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Most of their party were let through the customs without an examination.

他们一行人大多数没检查就让通过了海关.

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A number of mistakes in the proofs were let through.

在这些证据中有许多错误之处都放过了.

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