1 N-COUNT (化学上的)连锁反应，链式反应 A chain reaction is a series of chemical changes, each of which causes the next. (化学上的)连锁反应，链式反应
2 N-COUNT （事件的）连锁反应 A chain reaction is a series of events, each of which causes the next. （事件的）连锁反应
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Whenever recession strikes, a chain reaction is set into motion.
只要经济不景气，连锁反应就开始了。
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The powder immediately ignited and set off a chain reaction of explosions. [+ of]
火药立即点燃，引发一连串爆炸。
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