circuit opening relay

at-the-opening (opening only) order

Opening-Closing-Opening Test

reform and opening-up; reform and opening to the outside world

FR-FR Frame Relay – to – Frame Relay

phase-rotation relay phase-sequence relay

phase-sequence relay phase-rotation relay

slow-release relay (=slow-releasing relay)

[endoscopic]biopsy channel opening

2008 Beijing Olympic Ceremony Opening

30 years after the Reform and Opening Up

30 years of Chinese Reform and Opening

30 Years of Reform and Opening

30 years of reform and opening-up

30 years since the introduction of reform and opening up

30 Years’ Reform and Opening

30 years’ reform and opening-up

30°tilted opening

3-D square opening cavity flow