Definition: a series of things that happen one after the other Level: B2
这一事件引发了一连串危险的事件，最终导致了一场重大危机。
The incident started a dangerous ___chain of events that led to a major crisis.
他的到来引发了一连串令人惊讶的事件。
His arrival set off a surprising ___chain of events.
这项政策变化在整个行业引发了一场意想不到的连锁反应。
The policy change triggered an unexpected ___chain reaction across the industry.
