2.The army uses a special cipher so that military messages are kept secret.
"军队使用一种特殊密,军事电讯因此得以保密。"
3.The ciphers unlocked the whole letter.
密的方法使整封信的意义得到说明。
4.I couldn't cipher out his motives.
我猜出他的动机。
5.It’s a telegram in cipher.
这是密电报。
6.Double-frequency cipher can solve the problem of multimachine mutual interference fairly good by handling the remote control and autocorrection of welding current.