1. The directional of microphone: the unidirectional and the noise canceling microphone have vents at the bottom; oppositely, the omnidirectional microphone is completely sealed. 麦克风指向性：麦克风背有有气孔的，就是有指向性或抗噪型的麦克风，完全密封的，就是全指向的麦克风。
2. The directional of microphone: the unidirectional and the noise canceling microphone have vents at the bottom; oppositely, the omnidirectional microphone is completely sealed. 麦克风指向性：麦克风背有有气孔的，就是有指向性或抗噪型的麦克风，完全密封的，就是全指向的麦克风。
3. The directional of microphone: the unidirectional and the noise canceling microphone have vents at the bottom; oppositely, the omnidirectional microphone is completely sealed. 麦克风指向性：麦克风背有有气孔的，就是有指向性或抗噪型的麦克风，完全密封的，就是全指向的麦克风。
4. White smoke looked like proud of the success, all of a sudden, the door "boom, boom, boom" in the ring, three-step success of desertification are two steps to open up. 白烟看了看成功得意的样子，突然间，门“咚、咚、咚”地响了起来，成功三步化做两步地开了们。
5. After a pause, a recording will be played back to you. If it sounds like you are blowing into the microphone, reposition the microphone, and repeat the above sentence. 暂停后，将为您播放一段录音。如果它听起来象是您在对着麦克风吹气，请重新安放麦克风，然后重复上面语句。
