词汇	振铃信号制
释义	振铃信号制 ring-down system
随便看	confidentiality code confidentiality data-swapping confidentiality key management services Confidentiality Obligations confidentiality of data confidentiality policy confidentiality procedure confidentiality provisions confidentiality security confidential letter confidentially confidential mailbox confidential memorandum confidential message confidential message read-out Confidential Modified Handling Authorized Confidential-Modified Handling Authorized confidential monthly order confidential nature of working paper of audit confidential qualification confidential quotation confidential reception confidential relation confidential report confidential reporting system