显示经济指标变化与经济活动总周期变化同步变化的指数。
An index of economic indicators whose movements closely coincide with the overall cycle of economic activity.
而滞后指标是跟随经济周期变化的经济指标，同步指标则与经济周期活动同时变化。
Lagging indicators follow the changes of economic cycle whereas synchronized indicator changes synchronized with it.
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