In this mixed environ ment humans can easily detect frequencies as fine as one twelfth of an octave—a half step in musical terminology.
于是，在混合的声音环境中，人类能够听得到的声音频率能够精细到一个八度音阶的12分之1，即音乐术语中的半音（此处感谢Zakk指教）。
Each and every one of us needs to accomplish. achieve and triumph to be happy. Our human spirit requires it. Remember that happiness thrives in activity and accomplish ment.
我们每个人都需要实现幸福，获得幸福，成就幸福我们人类的精神生活需要幸福，记住：幸福在行动和成就感中生生不息！
Each and every one of us needs to accomplish. achieve and triumph to be happy. Our human spirit requires it. Remember that happiness thrives in activity and accomplish ment.
我们每个人都需要实现幸福，获得幸福，成就幸福我们人类的精神生活需要幸福，记住：幸福在行动和成就感中生生不息！
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