流调 liúdiào epidemiological survey Origin Definitions Defs Strokes Stroke Words Sentences Sents 流 liú abbreviation of 流行病 liúxíngbìng epidemic An infectious disease that spreads rapidly within a large population or geographic area; epidemic disease调 調 diào verb abbreviation of 调查 調查 diàochá to investigate to investigate; to survey; to inquire into actual conditions