To guarantee that existing slides can maintain their state, each slide has its own unique id and order indicator.
要保证现有幻灯片能保持其状态，每个幻灯片都要有自己独特的ID和顺序指示器。
To guarantee that existing slides can maintain their state, each slide has its own unique id and order indicator.
要保证现有幻灯片能保持其状态，每个幻灯片都要有自己独特的ID和顺序指示器。
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