例如，苹果的指引说明视频的音频流，不应该比40kbps的比特率更高。
For example, Apple's guidelines state that a video's audio stream should never have a higher bitrate than 40kbps.
用来观察物体细节的简单目视光学器件，是焦距比眼的明视距离小得多的会聚透镜。
Used to observe the details of a simple visual objects, optical devices, is the focal length than the distance between eyes, as much out of the convergence lens.
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