场内交易商(floor traders，指在交易所场内主要为自己或自己占有份额的帐户进行交易的交易所成员—译注)无法追踪电脑驱动的订单，特别是卖出上市交易基金(ETF，盯住某一指数的股票组合)的订单。

Floor traders were unable to keep track of computer-driven orders, particularly those selling exchange-traded funds—baskets of stocks linked to an index.

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到今年为止，仅仅美国就有超过95支这种基金上市交易，且大部分都是在纽约证券交易所，ETF被视为纽交所上市收入的主要来源。

So far this year, more than 95 have started trading on American markets alone, many of these on the New York Stock Exchange, which sees ETF listings as a key source of listings income.

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ETF类似于指数型共同基金，也像股票一样在交易所上市交易。

Exchange-traded funds resemble index-oriented mutual funds and trade on an exchange like a stock.

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