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Active Acoustic Device 有源音响装置
active acoustic detecting device 主动声探测仪
And both American and Israeli armies and some less scrupulous police forces around the world are said to have used a sonic tool, the “long range acoustic device”. 美国和以色列以及世界上做事欠谨慎的警察据说都使用过一种叫做“远程声学装置”的音波武器。
adaptive active acoustic structure 有源声学结构
Launched Expendable Acoustic Device 发射的可消耗声音设备
Study on the Optimal Operating Frequency of the Underwater Active Acoustic Detecting Device 水中主动声探测仪的最佳工作频率研究
Optimum Configuration Design for Active Acoustic Structure 有源声学结构系统配置优化设计
Active Acoustic Radiation Control of Elastic Linkage Mechanisms 弹性连杆机构声辐射的主动控制
Active Acoustic Signal Detection Based on Wavelet Transform 基于小波变换的舰船辐射噪声检测
Norris, an intrepid entrepreneur who has no college degree but more than 43 patents to his name, invented both the crowd control tool, called the Long Range Acoustical Device (LRAD), and the display audio technology, called HyperSonic Sound (HSS). 他是一位无谓的企业家，他没有大学文凭，但却有拥有43个专利，他的发明包括人群控制工具，叫做远程声音设备（LRAD），还有展示音频技术，叫做超音速声音（HSS）。
The orient has been playing an active role in the world economy. 亚洲一直在世界经济中发挥积极作用。
an acoustic device; the part of a telephone into which a person speaks 一种声音装置；人用来讲话的电话机的一部分
Low-frequency active sonar has been proposed as a replacement for traditional high-frequency active sonar, and it can detect the target under water over long ranges using low-frequency active acoustics. 低频主动声纳是对传统的高频主动声纳的一种重大改进,它能利用低频主动声信号实现对水下目标的远距离探测。
In this thesis, the study is focused on the characteristics of distributed sound source and its using in the active acoustical structure as the secondary source, including the foll. 本文为有源声学结构研究的一部分，侧重于研究分布式声源的声学特性，并对其作为次级源在有源声学结构中的应用进行了深入的研究。
an acoustic device; the part of a telephone into which a person speaks. 一种声音装置；人用来讲话的电话机的一部分。
He is an active member of the school's stamp club. 他是学校集邮俱乐部的一名活跃会员。
An active volcano may explode at any time. 活火山随时都有可能爆发。
Is it wise to engage in active sports at your age? 我这样的年纪积极参加体育活动是否明智？
She was active as a left-winger in the party. 她是党内积极的左翼分子。
The exhibition hall has perfect acoustics devices, lighting devices, supervision devices and fire control equipments. The exhibition hall can hold various art exhibitions. 展厅音响设施、灯光设施、监控设施、消防设施齐全完备,可承担雕塑等各类艺术展览。