protective casing

基本解释

Already free of the protective casing around his foot, Rooney is walking without discomfort and will step up his training next week.
現在魯尼腳上的保護裝置已經拆除，他已經可以無障礙的走路了，下周就可以恢複訓練。
The two-stage cementing technique was used for the protective casing of the horizonal well in Tahe oil field because of a long open-hole interval in secondary spudding.
塔河油田水平井由於第二次開鑽裸眼段長，技術套琯採用雙級固井技術。
The protective casing plays the role of protecting the electronic thermometer and the electronic watch at one side face of the electronic thermometer is convenient for mastering time by people.
保護套能對電子溫度計起到保護的作用；電子溫度計一側麪的電子表方便人們掌握時間。
ip.com

Hydraulic fracturing involves the injection of fluid consisting of approximately 99.5% water and sand (the rest consists of common industrial or even household chemicals or materials) through wells constructed with protective casing and cement, into producing shale formations.
FORBES: Why Anti-Fracking Groups Are Shifting Their Story From Water To Air Quality