sound transmission短语¹¹⁴⁴⁶⁷⁺⁴ 基本例句 声透射 The relationship between sound transmission, signal type, signal parameter and environmental adaptation of Lipotes vexillifer in captivity was preliminarily studied. 本文报道了人工饲养条件下白鱀豚的发声、发声信号的类型和信号参数及其与环境适应的关系。 cnki