First, the authors assert that manufacturers are unable to track AED units, making it impossible to know how many AED units were actually fixed or taken out of service.
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释义
首先,作者声称生产商不可能对每一台AED机进行跟踪,所以他们不可能知道多少台AED机已进行了维修,还有多少台已经报废。
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