How do I demagnetize tape heads?

我如何消磁音带头？

I think they forgot to demagnetize it.

我想他们忘了给它消磁了。

Don't put magnets near credit CARDS because it might demagnetize them.

不要把磁棒靠近信用卡，可能会使卡消磁。

Demagnetize that same piece of steel and it will be powerless to attract or lift even a feather's weight.

如果将它的磁性消退，那么它连一根羽毛重量的铁块都吸不住。

Wait, can you check these sunglasses? I bought it in the second floor. I think they forgot to demagnetize it.

等一下，您能看看这副太阳镜吗？我在二楼买的。我想他们忘了给它消磁了。