Searching an optimized executive strategy for every complex query is the key of success for database development. In database field, it is still an N-P problem.

对于一个复杂的查询，寻找一个优化的执行策略是数据库系统开发成功的关键所在，此项研究目前在数据库领域仍属于N - P问题。

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"It seems that this recovery is finally under way, " said George N. Hatsopoulos, chief executive of the Thermo Electron Corporation, a maker of industrial instruments in Waltham, Mass.

“看来这次复苏终于开始，”马萨诸塞州沃尔瑟姆市一家制造工业仪器的热电子公司总经理哈特索波罗斯说。

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But now executive secretary of the U.N.Framework Convention on Climate Change Yvo de Boer says any decision taken next month in Copenhagen will instead be "morally binding."

VOA: standard.2009.11.06

Deputy Executive Director of the U.N.Children's Fund, Saad Houry, agrees that the reality does not always live up to the Convention's vision of a world that is made safe for all children.

VOA: standard.2009.10.08

Setting up ICICI's leasing business from scratch and helping then executive chairman N.

FORBES: On The Cover/Top Stories

Which is why Chief Executive Andrew N.

FORBES: Who You Know

"Water is the nuclear industry's Achilles heel, " Jim Warren, executive director of N.

FORBES: The Water-Industrial Complex