Using my knife, I attempted to pry the metallic casing off, thinking it a cowl for the actual finger beneath. This proved futile as the substance resisted all attempts at penetration.

我以为这截玩意是戴在真手指上的套子，所以想用小刀试着将这个金属部分撬出来，但那物质坚硬无比，撬了半天还是丝毫不动。

youdao

But in case it has to evacuate the area around the damaged well, which lies some 50 miles off the Louisiana coast, BP also placed a special plug inside the well's casing.

但是为了预防，必须从离路易斯安那海岸大约50英里的毁坏的油井附近区域撤离，BP也在油井盒里放置了一个特殊的塞子。

youdao

The main reason that casing falls to the hole by breaking off thread is casing thread quality can't reach the criteria, and the management of casing running into the hole is not strict.

套管脱扣落井的主要原因是套管扣加工质量达不到规范要求，以及套管入井管理不严造成的。

youdao

"We want to get the lead inside, so instead of chopping the pencil up perpendicularly and exposing just the ends, we strip the wood casing off the outside and expose the length of the lead, " says Litzen.

FORBES: Ethanol

Sitting on the floor of his room, Hotz twisted off the screws of the black PS3 and slid off the casing.

NEWYORKER: Machine Politics

Then there is Halliburton, which was contracted to cement the production liner in the well casing, effectively sealing off the reservoir from the well bore.

FORBES