casing
n. 套；盒；（香肠的）肠衣；包装
v. 把……装入箱内（case 的 ing 形式）
复数 casings
例句
The vacuum flask has a strong casing, which won't crack or chip.
这个真空瓶有一个坚固的外壳，不会破裂。
《柯林斯英汉双解大词典》
When most people think of the word "education", they think of a pupil as a sort of animate sausage casing.
当大多数人想到“教育”这个词的时候，他们把学生看作是一种活生生的香肠肠衣。
Many of them have dropped their Blackberry over and over with little more than some scratches on the casing.
他们中的许多人一次又一次地把他们的黑莓手机掉在地上，而手机外壳上只有几处划痕。
