保护外壳 meaning in English

protective casing

Protective , metallic , cap , for nf l 40 - 104 male fittings and similar types . iso metric thread profile and tolerances
Nfl 40 - 104和类似型式接头阳螺纹端用金属保护外壳. iso米制螺纹剖面和公差
According to new research , the influenza virus coats itself in a protective fatty shield that is tough enough to withstand cold temperatures
一项最新研究发现，流感病毒表面包有一层脂肪保护外壳，这种外壳十分坚硬，能抵御严寒。
Electrical apparatus for use in the presence of combustible dust - part 1 - 1 : electrical apparatus protected by enclosures ; construction and testing ; amendment a1 ; german version en 50281 - 1 - 1 : 1998 a1 : 2002
易燃灰尘区域用电气设备.第1 - 1部分:带保护外壳的电气