【英语时差8,16】泰国斗鱼（下）

As it turns out, bystanders that have witnessed a fight between two rivals are much less likely to challenge the winner of the fight than they are to challenge the loser. In other words, these fish are keeping score. By remembering–and avoiding–the winners of other fights, these rubbernecking fish can protect themselves from bodily harm. This research is interesting because it hints at an unrecognized complexity¹ in the social interactions of fish. While it’s well known that certain mammals–including humans–and certain very social birds are natural born rubberneckers, it’s hard to find this behavior in the lower animals. For the Siamese fighting fish though, rubbernecking is a matter of survival.

1 complexity   

n.复杂(性)，复杂的事物

参考例句：

• Only now did he understand the full complexity of the problem.直到现在他才明白这一问题的全部复杂性。
• The complexity of the road map puzzled me.错综复杂的公路图把我搞糊涂了。