casing

外壳、机壳、保护套

The phone's plastic casing cracked when it hit the floor.

手机的塑胶外壳掉到地上时裂开了。

肠衣

Traditional sausages use natural casings made from animal intestines.

传统香肠使用动物肠子制成的天然肠衣。

门框、窗框

He painted the window casing white to match the walls.

他把窗框漆成白色，好搭配墙面。

外胎

The tire casing was worn down to the fabric layer.

轮胎外胎已经磨到露出纤维层。

套管

Workers lowered steel casing into the newly drilled well.

工人把钢制套管放进刚钻好的井里。

勘查、探查口语

They spent a week casing the bank before the robbery.

他们在抢案前花了一周勘查那间银行。