在同步过程中，只有变更在不同地点间迁移，不是整个的VOB 1副本。
During synchronization, only the changes are moved between locations, not entire VOB 1 copies.
这样做的主要缺点是，新的 XML 列与副表之间没有固有的同步机制。
The main drawback with this approach is that there is no inherent synchronization between the new XML column and the side tables.
色同步信号是为了在接收端恢复与发送端被抑制掉的色副载波同频同相的载波而设置的。
Color synchronous signal is setup to resume subcarrier color signal as same frequency and phase in receive end, which is suppressed in send end.
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