The late selling followed a big board announcement that curbs on computerized trading techniques will go into effect today for a week.

纽约证券交易所宣布自今日生效，为期一周限制使用电脑交易技术。此一规定在收市前引起抛售。

Most of the time, computerized trading makes stock markets more efficient, and it's easier and cheaper for investors, both large and small, to trade.

大多数情况下，计算机交易使股票市场更加高效，对投资者，不管是大额还是小额交易，交易起来都更加容易和便宜。

Given the volatility in the markets and concern that computerized trading exaggerates the ups and downs, the notion that Wall Street is engineering news-bots might sound like an investor's nightmare.

由于市场的波动性和担心计算机自动处理的交易加大了市场的上涨和下跌，有人认为华尔街正在制造的新闻机器人听起来像是投资者的恶梦。

But they still have to temper all their computerized ambitions with the realities of trading with business partners, many of whom are not as sophisticated.

但是考虑到与商业伙伴——其中许多还不够成熟——交易的事实，他们还必须控制实现计算机化的雄心壮志。

The Computerized Negotiation System will execute each trade one trading unit at a time.

电脑议价系统每次成交以一交易单位逐一进行成交。

The average time a stock is held is 22 seconds, as computerized high-speed trading accounts for most transactions, according to analysts at the University of Missouri.

美国密苏里大学分析人员表示，由于电脑系统可高速处理多数股票交易，一只个股平均被持有的时间只有22秒。