Photo story: A day of post-80s twin police officers

In China, 110 is the police emergency phone number. Long Xian and Long Yan are post-80s twin sisters working in a 110 police service center in Luliang, north China's Shanxi province. Every day, they have to answer emergency calls one after another. The strict requirements and high pressure often make them exhausted. However, they love their work, and believe the work is sacred and full of justice.