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。
"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。
"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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