mindmap root((发生)) happen is the ordinary and general term applying to whatever comes about with or without obvious causation or intention: remembering an incident that ~ed in his childhood. chance regularly implies absence of design or apparent lack of causation: a man he ~d to know. occur stresses presentation to sight or attention: such events, when they ~, fascinate the public. transpire implies a leaking out so as to become known or apparent: the meeting ~d as planned.