Since the PSO has fast calculation, simple calculation method, and easy realization. Scholars in various fields paid close attention to it at once as it was put forward.

由于粒子群算法计算速度快，算法简单易实现，一经提出立即引起各领域学者的高度关注。

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But Europe's fast-falling inflation has put the bank under increasing criticism that it has been too slow to join its peers in bringing rates close to zero, exacerbating the euro zone's slowdown.

但是欧洲通货膨胀率的快速下降令欧洲央行面临越来越多的批评，称它在将其他一些国家央行将利率降至接近零的水平时行动过于迟缓，结果加剧了欧元区的经济放缓。

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But Europe's fast-falling inflation has put the bank under increasing criticism that it has been too slow to join its peers in bringing rates close to zero, exacerbating the euro zone's slowdown.

但是欧洲通货膨胀率的快速下降令欧洲央行面临越来越多的批评，称它在将其他一些国家央行将利率降至接近零的水平时行动过于迟缓，结果加剧了欧元区的经济放缓。

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