两个命令之间的差异在于，gets 返回的信息稍微多一些：64 位的整型值非常像名称/值对的 “版本” 标识符。
The difference between the two commands is that gets returns an extra bit of information: a 64-bit integer that acts much like a "version" identifier of a name/value pair.
音像店的店员已经习惯了接受“哼唱问询”：一位顾客走进店来，把他想要，却又记不起名称或者歌手的那首歌哼唱出来。
Assistants in record shops are used to receiving "humming queries" : a customer comes into the store humming a song he wants, but cannot remember either the title or the artist.
OSD中的每个对象由平面名称空间中一个64位的标识符表示。
Each object in an OSD is represented by a 64-bit identifier in a flat namespace.
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