您要查找的是不是：
- A unidirectional microphone. 单向性的麦克风
- phase-shifting unidirectional microphone 移相式单向传声器
- Speak clearly into the microphone. 对著话筒说清楚些。
- The lecturer speaks through a microphone. 演讲者通过麦克风说话。
- unidirectional microphone 单向传声器
- He is talking into a microphone. 他正在对着麦克风讲话。
- He used a microphone so that everyone could hear him. 他使用扩音器，使人人能听见他的讲话。
- A hidden microphone, as on a person's body or in a building. 隐形话筒，窃听器如放在人身体上或建筑物上的不让外人看到的麦克风
- To supply with or transmit through a microphone. 通过话筒传送通过话筒提供或传送
- The reinforcement was unidirectional. 增强是单方向的。
- Channels can be unidirectional or bidirectional. 通道可以是单向的或双向的。
- An electrical system fed by unidirectional voltage. 由直流电压供电的系统。
- Plug in the microphone or no one will hear me. 请把麦克风插上，不然没人听得到我的声音。
- First this is an unidirectional adjustment. 首先这是一次单向调节。
- When we make a speech, we often use a microphone. 我们讲演时经常使用麦克风。
- An icon appears in the upper portion of the screen to indicate when the microphone is muted. 当对麦克风进行消音时，会在屏幕的上部出现一个图标。
- He clipped the microphone(on) to his collar. 他把麦克风别在衣领上。
- Point the microphone toward your mouth. 将麦克风对准嘴部
- She's walking up to our microphone now. 现在她向我们走来了。
- Conversion of alternating to unidirectional current. 整流交流电转变到单向电流
