N-COUNT
無足輕重的人；走狗;小兵小卒
If you describe someone as a cipher, you mean that they have no power and are used by other people to achieve a particular purpose.
例句
He was little more than a cipher who faithfully carried out the Fuehrer's commands.
他只不過是個走狗，忠實執(zhí)行元首的命令。