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It is common for relational databases to use the concept of primary keys, generated by an auto-increment feature or by a sequence generator.
在关系数据库中通常可以使用主键，它由一个自动递增特性或序列生成器生成。
One very useful feature of slicing is that slicing too much, going before the start or past the end, doesn't throw an exception but simply defaults to the start or end of the sequence, as appropriate.
进行切片的一个非常有用的特性是，在开始之前或结束之后进行较多切片不会抛出异常，只是相应地以默认方式开始或结束该序列。
If you record a sequence and assign it to channel 5, for example, only an instrument set to listen on channel 5 plays back the sequence, this feature enables MIDI networks to sound like orchestras.
例如，你记录了一个音乐序列并将它设置到第五声道上，并且只有一种乐器在第五声道上回放这个音序，其效果使MIDI网听起来很像乐队。
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