防护壳 meaning in Chinese

containment envelope
protecting crust
protecting shell
protective shell

Strength capability analysis of a flight data recorder protecting housing
某型飞行数据记录器防护壳体强度性能分析
Fixed railway installations . signalling . junction boxes . protective sheaths
铁路固定装置.信号装置.接线箱.防护壳
Enclosures for protection against ionizing radiation . lead shielding units for 150 mm , 200 mm and 250 mm thick walls . part 1 : chevron units of 150 mm and 200 mm thickness
电离辐射防护壳.厚度为150mm , 200mm和250mm的铅防护壳.第1部分:厚度为150mm和200mm的波纹式防护壳