sheath

noun

1. a dress suitable for formal occasions

Synonym: cocktail dress

2. a protective covering (as for a knife or sword)

3. an enveloping structure or covering enclosing an animal or plant organ or part

Synonym: case

1. (刀、剑的)鞘，套
A sheath is a covering for the blade of a knife.

2. 保险套;避孕套
A sheath is a rubber covering for a man's penis and is used during sex as a contraceptive or as a protection against disease.

1. sheath

1. 鞘：将模型平放,让牙合平面与牙长轴尽可能垂直,用带加强鞘(sheath)的铅芯描计杆(carbon marker)画出基牙的观测线. 此时的观测线为牙体的最大周径线. 倾斜模型,确定就位道,在就位道方向上画出基牙、余留牙和粘膜区观测线. 结合两条观测线,

2. 外皮：MI电缆 (MINERAL-INSULATED CABLE)系指以无机物做为绝缘,以铜 金属外皮(Sheath)做为气体及液体之密封之电缆. 在危险气体,蒸气场所设施线路时,限按金属管或电缆装置法施工,依 金属管施工者应符合左列要求: 一、金属管必须为厚金属导线管之规格者.

3. 护套：数据线缆的保护套(sheath)在物理上分为两部分:绝缘层(insulation)和外套(jacket),线缆是否具有防火功能主要取决于最外一层护套的材料. 总体而言,数据通信电缆的外皮有4种:1、聚氯乙烯(PVC)材料,容易燃烧且会产生有毒气体.

4. 套：屏蔽式双绞线(STP)具有一个金属套(sheath),对电磁干扰EMI(Electromagnetic Interference)具有较强的抵抗能力,适用于网络流量较大的高速网络协议应用.