The major works of this paper are listed as follows. Design a context-aware middleware and implement a prototype system.

本文的主要工作涉及以下几个方面：设计了一种上下文感知中间件，并实现了原型系统。

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The sensor nodes must be aware its position to explain 'what happens and where ', to implement the target of the location and tracking.

传感器节点必须准确定位才能说明“在什么位置或区域发生了特定事件”，实现对外部目标的定位和追踪。

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"Mexico is aware this is the end of the oil era, so we need to implement this fiscal reform - and if we go through it, we'll be able to do without this oil, " he said.

BBC: Inside Mexico's climate revolution