她向我们演示如何把一大串钥匙变成一个应急指节铜环，给袭击者造成最大的伤害。
We were shown how to transform a bundle of keys into a makeshift knuckle-duster in order to inflict maximum damage.
应急技术服务人员对产品有足够的日常经验和理解深度，可向客户演示和指导如何维护和修理设备。
The Field Service Technicians have the daily experience and depth of product knowledge to demonstrate and instruct customers on the maintenance and repair of the equipment systems.
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