They saw that the male cleaner fish — even in this unfamiliar lab setting — would punish or chase away the female fish if the females ate a prawn.
他们看到，如果雌鱼吃了对虾——即使是在这个陌生的实验室环境中——雄性裂唇鱼也会惩罚或驱赶雌鱼。
2
If they kept on going, and the next night they saw the pair of stars setting separately, then they would know that they were at a different degree of latitude.
如果他们继续走，第二天晚上看见这两颗星星分别落下，就知道他们在不同的纬度上了。
3
In Part 7 you saw how we implement our method of automatically setting a class value based on what section of the Web site is being displayed.