modulated structure造句

*W . Selke, " Spatially Modulated Structures in Systems with Competing Interactions " . In " Phase transitions and critical phenomena ", eds.
Their echolocation calls have a classic frequency-modulated structure that allows these bats to navigate through cluttered environments, although they are shorter, quieter, and higher pitch ( 126 to 60 kHz ) than those of other " Myotis " bats.
It's difficult to find modulated structure in a sentence. 用modulated structure造句挺难的