根据声源的频谱特性在其前后配置合理的管道式消声器、金属外壳式消声器、结构式消声器作为消声降噪的措施。
According to the spectral characteristic of the noise source, the tube-type muffler, metal-enclosure muffler, structural-type muffler can be equipped before and after the noise reduction devices.
虽然可以仅仅执行安装，在安装前后不进行任何配置，但是我们建议目标系统至少有1gb的空闲ram和1gb的空闲磁盘空间。
Although it is possible to perform the installation without any pre - or post-installation configuration, we recommend that the target system have at least 1gb of free RAM and 1gb of free disk space.
前后两端分别配置有摄像头，背面的摄像头用于拍摄高清影片和照片，前端的色相头用于视频会话。
There are the front and rear cameras —the rear for shooting videos and photos, the front for FaceTime video conferencing.
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