sheaths
[ʃi:ðz]
n.
（刀、剑或工具尖锐部分的）鞘( sheath的名词复数 );
（男用）避孕套;
（植物或动物器官的）鞘状（包覆物）;
外层覆盖（物）;
例句:
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Durex, sheaths, johnnies, rubbers, something for the weekend.
来自BBC
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As the two charge distributions separate, leaving positive and negative sheaths.
当两种电荷分布开始时, 就留下正离子鞘和负离子鞘.
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The production of sheaths has led to some new and unexpected difficulties.
制造被筒时引起一些新的未预料到的困难.
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In addition, various precision spiales and metallic sheaths can be made.
同时, 可承接各种精密轴、套类零件的加工制造.
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The firm exploits silks for medical applications such as sheaths to help nerve regrowth.
来自BBC
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It defies logic that we will be able to get the best out of health information with sheaths of paper flying around by snail mail.
来自WSJ