protective casing短语⁹⁶⁶⁷⁷⁺⁶ 基本例句 保护外壳; 保险罩 Its drilling system uses a380- ton protective casing over the wellhead that is about the size of a six- story office building. 它的钻探系统采用了重380吨、约六层办公大楼大小的保护罩防爆装置来保护井口。 iciba Within a few weeks, all the equipment was found to be covered in thick layers of brake dust and needed to be put into protective casing. 过了几个星期后，发现所有设备都被闸盖上薄薄的一层灰土覆盖了，必须要铺上保护罩。 ecocn