When you rent or buy a DVD, the checkout clerk rubs it across a pad to demagnetize the metallic glass so it won't trigger an alarm when you leave.

当你租或者买DVD光盘时，收银员会把它滑过一个垫子使其中的金属玻璃退磁，所以在你离开的时候不会引起警报。

youdao

Advantage products and services: electric motor and their components, computer case, metallic body of laptop cooling pad etc.

优势产品及服务：电机马达及其配件，电脑机箱，金属散热垫主体外壳等等。

youdao

Despite a bunch of metallic objects being heaped on the pad, it was intelligent enough to only send power to the phones, keeping gum boxes and coins cool, calm and collected.

ENGADGET

The keypad is plenty usable, with large metallic keys, but the recessed d-pad makes navigation a bit of a chore.

ENGADGET: Samsung's "RAZR KILR" A900 reviewed Mobile