A child tries to spray with a fire hose while visiting the Richmond Fire Hall during the annual open doors event in Richmond, Canada, June 3, 2018. The annual open doors event gives citizens free access to dozens of sites in the city to learn more about the heritage and operation in community. (Xinhua/Liang Sen)

A child experiences sitting inside a police car at the Royal Canadian Mounted Police's main detachment during the annual open doors event in Richmond, Canada, June 3, 2018. The annual open doors event gives citizens free access to dozens of sites in the city to learn more about the heritage and operation in community. (Xinhua/Liang Sen)

A child sits inside a fire truck while visiting the Richmond Fire Hall during the annual open doors event in Richmond, Canada, June 3, 2018. The annual open doors event gives citizens free access to dozens of sites in the city to learn more about the heritage and operation in community. (Xinhua/Liang Sen)

A child tries to lift a helmet at the Royal Canadian Mounted Police's main detachment during the annual open doors event in Richmond, Canada, June 3, 2018. The annual open doors event gives citizens free access to dozens of sites in the city to learn more about the heritage and operation in community. (Xinhua/Liang Sen)

A police officer explains different objects on his uniform to visitors at the Royal Canadian Mounted Police's main detachment during the annual open doors event in Richmond, Canada, June 3, 2018. The annual open doors event gives citizens free access to dozens of sites in the city to learn more about the heritage and operation in community. (Xinhua/Liang Sen)