One who or that which changes.

改变者；改变的东西。

A vessel in which materials undergo change of condition.

(使物质改变之)转化器；转化炉。

(Also convertor), a device for changing electrical energy from one form to another, as from an alternating current to a direct current.

【电】整流器；变流器。

A device for adapting a television receiver to receive channels for which it was not originally designed.

【影视】变频器。