Simulations (IMAGE) Science China Press Caption Simulations of acoustic wave propagation in a triangular structure (r=0.1) with different boundaries as indicated in (a)-(d). Credit ©Science China Press Usage Restrictions Use with credit. License Licensed 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.