Self-sustaining nuclear fission in which the number of nutrons produced is steadily equal to or greater than the number lost.

【化】连锁反应。核分裂时放出的中子撞击其他原子核，再引发其他核分裂。这个过程一经启动便会不断重覆，所以叫做连锁反应。

Any series of events in which each event is the result of the one prededing and the cause of the one following.

连环事件。