A dark pool is a private exchange where somebody running it allows customers to anonymously transact.

暗池是一种私人交易所，运行它的人允许客户进行匿名交易。

There are residences in New York City that have private branch exchanges, like a bank or a newspaper office.

纽约市的住宅设有私人分行， 例如银行或报社。

A lot of outside groups, the insurance companies, some outside private exchanges like eHealthInsurance, have wanted to sign up what they call the subsidy-eligible people. And there are a lot of them.

许多外部团体、保险公司、一些外部私人交易所（如 eHealthInsurance）都希望注册他们所谓的符合补贴条件的人。而且有很多。