A third of the kids also carried a backpack fitted with an air-sampling device and a GPS to pair up readings and precise locations.
其中三分之一的儿童还随身携带一个背包，内置空气取样器和GPS，以便将取样器的显示数据和确切位置相匹配。
A third of the kids also carried a backpack fitted with an air-sampling device and a GPS to pair up readings and precise locations.
其中三分之一的儿童还随身携带一个背包，内置空气取样器和GPS，以便将取样器的显示数据和确切位置相匹配。
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