One year, to get the study groups just-so, Ms. DeGraca laid out index CARDS with students' names and basic facts on her living room floor, mixing and matching until the groups seem balanced.

有一年，为了实现精确分组，德格拉卡在自家客厅地板上把标有学员名字及基本概况的索引卡摊了一地，试验了各种排列组合，最终使所有人员得到了均衡的分配。

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

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。

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Keep the thumbs and index fingers pressing into the floor.

大拇指和食指用力下压。

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As a result, the VIX is now being squeezed into technical support in the 17-17.50 area, a region that has provided a floor for the index since late January.

FORBES: Connect

They broke the book down into hundreds of scenes, copied them onto colored index cards, and spread the cards on the floor, with each color representing a different character or time period.

NEWYORKER: Beyond the Matrix

The index remains trapped beneath its 50-day moving average and the 16 level, which provided a floor for the VIX in February.

FORBES: Futures Flat Ahead of Housing Data; KB Home, Nike, and Ohio Art Co. in Focus