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，这一点在safew官方下载中也有详细论述
The engines fired and Apollo 8 slid silently behind the Moon. The men heard a crackle in their headsets as the radio signal to Mission Control faltered and then failed.，详情可参考一键获取谷歌浏览器下载
bufferedEnd = audioElement.buffered.end(i);，更多细节参见51吃瓜