In contrast, index futures have played an active role in maintaining the stability of the spot market, and a certain correction function on the over - reaction with spot market.

相反，股指期货为现货市场稳定发挥了积极的促进作用，对现货市场的过度反应起到了一定修正功能。

youdao

While active investment involves an asset manager making investments with the aim of outperforming a benchmark index, passive investment requires an asset manager to replicate the benchmark index by incorporating the constituent assets in similar proportions (weights) and thereby matching the returns of the index.

FORBES: BlackRock Priced A Bit Too Richly With Passive Investing So Popular