Some built algorithms to perform thefamiliar function of discovering, buying, and selling individual stocks (apractice known as proprietary, or “prop, ” trading).

创造出了与寻找股票、买入股票和卖出股票类似的算法（在实际操作中被称作所有权交易）。

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The system has accomplished all sorts of business, such as buying, stocking, and selling, and realized the function to send data to management center.

该系统实现了连锁加油站进、销、存各种业务管理，另外还包括向总部管理中心上传数据的功能。

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Simulation shows that the optimal price is a decreasing function of initial inventory and an increasing function of sale period and potential buying probability;

算例分析表明：最优价格是初始库存的递减函数，是潜在购买率和销售时间段的递增函数；

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Detroit and the auto makers claim there was no liquidity (nobody was buying cars or lending) for normal bankruptcy to function.

WSJ: Review & Outlook: Halftime in Detroit

Nations' reserves are these days mostly used to support or weaken the country's currency, by buying it or selling it in the open market - a function for which gold is unsuited.

BBC: NEWS | Business | Central banks set gold sale limit

In other words, when investment banks had ample capital prior to the financial crisis in 2008, part of their role was to function as a facilitator of fixed income and equity markets, buying securities with their own capital as prices fell and selling securities with their own capital as prices rose.

FORBES: Volatility And Hedge Fund Games Are Here To Stay