Beijing started to install automated external defibrillators (AED) in subway stations on Tuesday. By the end of 2022, all rail transit stations in the city will be equipped with AEDs, over 80 percent of frontline personnel will be certified. The photo shows staff of Beijing Emergency Medical Center introducing the techniques of using the AED at Xidan station on Line 1 on October 27, 2020. (Photos: Chinanews.com; Compiled by Chen Xi'nan)

An automated external defibrillator (AED) is installed at the Xidan transfer station on Line 4 October 27, 2020.

Photo shows staff of Beijing Emergency Medical Center introducing the techniques of using the AED at Xidan station on Line 1 in Beijing on October 27, 2020.