An efficient logistic system could hold the key to the success of electronic commerce.

物流系统的效率高低是电子商务成功与否的关键。

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Thero, under the background of the development of an electronic commerce system, the modeling process of electronic commerce system and key techniques based on UML are described in detail.

对UML的建模原理作了系统的介绍，然后以电子商务系统的开发为背景，详细的阐述了基于UML的电子商务系统建模过程和关键技术。

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Power system is an essential component of the Automotive electronic, voltage regulator of is the key component and the higher levels of technology in power supply system.

电源系统是汽车电子中不可或缺的重要组成部分，而电压调整器又是电源系统中技术含量较高的关键部件。

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Unlike other aircraft where the pilot's controls are manually attached to the flaps and rudders, Airbus 330 airliners are equipped with a "fly by wire" system that sends electronic signals from an onboard computer to move key control surfaces.

CNN: Could lightning have brought down Air France plane?