Case Based Reasoning (CBR) is a hot spot in expert system field in recent years.

基于事例推理(CBR)是近年来专家系统领域内的一个热点问题。

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A system field should only be used as an operand at a read position if its content is not set by the same statement.

如果语句不设置一个系统字段的值，则它只能作为一个读取位置的操作数来使用。

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Many system field failures occur because relativelyinexpensive parts wear out, causing unscheduled shutdowns with costs that arefar greater than the cost of the part.

很多系统发生故障是由于相对便宜的部件损坏，而它导致的非计划停机而发生的维修费用要比这个部件本身的成本高得多。

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"Perhaps most important,though, we can now field initial elements of the system to protect our forces in Europe and our allies roughly six to seven years earlier than the previous plan a fact made more relevant by continued delaysin the Czech and Polish ratification processes that have caused repeated slips in the timeline,".

VOA: standard.2009.09.17

The system split the field into four bands, positioning players between the lines of the opposition's defense and midfield, creating natural passing lanes that make it easier to retain possession.

WSJ: La Roja: How Spain Became the World's Best Soccer Team

This means agencies could power their communication system in the field using an improvised local network if a disaster wipes out Internet connectivity, electricity, or both, like Hurricane Katrina did along the Gulf Coast.

FORBES: Crisis Communicating

If the U.S. ever moves to a mandatory trading system, expect this field to boom.

FORBES: For Job Market, Green Means Growth