这把刀配有一个皮革刀鞘。
The knife comes with a leather ___sheath.
电工需要检查电缆的保护套是否完好无损。
The electrician needs to check if the protective ___sheaths of the cables are intact.
他把刀插回刀鞘里。
He slid the knife back into its ___sheath.
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