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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Real market case studies show how to properly apply the popular MACD indicator in order to generate early warning signals about changing trends in a variety of markets.

FORBES: Demystifying the MACD

Dr Schulte explained the team decided to carry out the study in order to identify effective indicator species that offered an insight into the health of the region's environment.

BBC: Elephant ecological engineering 'benefits amphibians'