栏目简介：Children cool off themselves at a wading pool in Toronto, Canada, on Sept 24, 2017The "Four Nos" refer to Washington's promise not to seek a regime change in Pyongyang, not to seek the collapse of the DPRK government, not to seek acceleration of reunification of the Korean Peninsula, and not to send its military north of the 38th parallel, which acts as the boundary between Pyongyang and Seoul