turn key system的用法和样例：
- They also poll key system files and executable files for unexpected changes.
- Do terminals require a turn key, card key or power-on password to turn on?
- Public announcement system is a key system in administrative law enforcement institution.
- We provide The Turn Key service is to offer a package service in test, appraisement, design and construction, which becomes the new industry standard gradually.
- The private key system is also called the single key system, in which the encryption process is the same as the decryption process.