chain reaction

1. N-COUNT A chain reaction is a series of chemical changes, each of which causes the next. 鏈式反應

2. N-COUNT A chain reaction is a series of events, each of which causes the next. 連環反應

The powder immediately ignited and set off a chain reaction of explosions. 炸葯立即點燃竝引發了連環爆炸反應。