However, it is also hard to keep a code book secret for long. So codes must be changed frequently.
然而,让密码本长时间保密,不被他人知道也是很难得。因此必须频繁更换密码。
2
Exceptions are hard to ignore, unlike error codes.
例外情况是难以忽视,不同的错误代码。
3
Most diagnostic trouble codes relate to the computer input voltages or signals and must exist for a specific period of time to be recognized as a hard fault.