词汇	country of flag
释义	country of flag 🌏船旗国
随便看	optical clock distribution optical clock extraction Optical clock recovery optical closure theory optical clouration optical clustering optical-coated abrasive optical coating Optical Coating Laboratories Incorporations optical coating materials Optical coatings optical code optical code conversion optical code-cylinder optical coded disc optical code division access optical code division multiple access optical code labeling switch optical code label switching Optical coder optical code reader optical code reading wand optical coding optical coefficient optical coherence