This week, for instance, Credit Suisse and Instinet, a broker, signed a mutual access agreement for their dark pools in Japan.

就拿本周来说，瑞信和经纪商Instinet在日本签署了他们的“黑池”可以相互访问的协议。

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There are now dozens of “dark pools” of liquidity, in which banks and institutional investors anonymously trade large blocks of shares.

现在有许多提供流动性的“黑池”，在里面银行和机构投资者匿名交易大宗股票。

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After several years of steep rises, trading volumes on dark pools have started to level off this year, according to the TABB Group, which tracks the industry.

一直关注这个领域的TABB Group说，在急剧上升了几年之后，今年暗盘交易的数量开始趋向平稳。

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In some cases, these dark pools allow outsiders entry to increase their order flow.

FORBES: Watch Out For The Quants

Chief Executive Bob Greifeld recently called for regulators to clamp down on dark pools.

WSJ: Ban on Flash Orders Is Considered by SEC

Some exchanges are even quietly creating dark pools of their own, buried within their main market.

ECONOMIST: Stock exchanges