transformer

By using a transformer, he translated the codes into translation he could read.

通过运用一个变压器，他将密码翻译成他读得懂的译文。

At high input impedances, in practice both efficiency and bandwidth of a transformer will reduce.

实际上高输入阻抗的变压器，它们的效率和频带宽度都会下降。

There is a transformer in there.

因为有一个变压器。