(IMAGE) City University of Hong Kong Caption (左起)汪建平教授、李文榮教授和機械工程學系博士生索姣。 Credit City University of Hong Kong Usage Restrictions Image must be used with appropriate caption and credit License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.