沙丁鱼在运输过程中常会大量死亡。于是有人在鱼桶里放入沙丁鱼的天敌──鲶鱼；沙丁鱼处在惊恐状态而拼命游动，其结果是鲶鱼救了沙丁鱼，避免了死亡。 沙丁鱼为什么会大量死亡呢？这与它的生长习性有关，它不爱活动，处于休眠状态，慢慢地就会死去。 有及于此。笔者联想到目 Sardines often die in mass transit. So some people in the bucket into the natural enemy of sardines ─ ─ catfish; sardines in panic and swim hard, the result is catfish save sardines, to avoid death. Why sardines died in large numbers? This is related to its habit of growth, it does not love activities, in a dormant state, will slowly die. There and here. I think of purpose