偵事一二 動機。永遠是一切的起源。 With ease，or not at all.

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 Tiny Over-The-Counter Pulse Oximeters May Save Lives During COVID-19 Pandemic SAN FRANCISCO (KPIX) – When it comes to COVID-19, a tiny over-the-counter device may potentially save your life. The new go-to gadget is called the pulse oximeter. Some health experts bel...