And when we simplify our models by introducing subsystems, we replace large sections of the sequence diagram with a single message to the subsystem.
当我们通过引入子系统来简化模型时,我们把序列图中大的段落替换成向该子系统发送一条简单的消息。
Avoid IDENTITY and SEQUENCE if possible, but otherwise use a large cache of values.
尽可能避免IDENTITY和SEQUENCE,如果不能避免,则使用较大的缓存。
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