She had therefore had a removablecover made and this was always secured by a padlock and chain.
所以她给这口井加了个活动了盖子，用这个挂锁和链子锁上。
2
A system is provided for detecting when an enclosure having a body and a removablecover is opened.
不带光源就是一个灯具，也就是外壳或配件，没有发光源体。
3
Both hollow pieces, the table has a transparent glass on top that gives the impression of a more ample space, and the stool has a removable cushion to cover the hole.