词汇	first sound diffraction
释义	first sound diffraction 声衍射
随便看	economic stabilization program economic stabilizer economic stagnation economic standard economic standard antenna economic standard order quantity economic standard room of side-building economics targeted at productive forces economic state economic statics economic statistician economic statistics economic statistics analysis economic status economic status of villagers economic status/position economic status survey of indigenous peoples economic statute economic statutes economics teaching economic steadiness economic steel Economics Theory economic stimulating effect economic stimuli