词汇	solid acoustical lens
释义	solid acoustical lens 固体声透镜
随便看	economic principle economic principle of environmental protection economic principle of motion economic principle of taxation economic principle part economic principles Economic Principles and Economic Statistics economic principles of production economic prior criteria economic problem economic problems Economic problems in foreign agriculture Economic problems of Socialism in the USSR Economic Problems of the USSR economic process economic processes economic procurement item economic product economic production economic production quantity economic production rate limit economic productivity economic profile economic profit economic profit acquirement