- They pick up rocks in their jaws
它们用长嘴捡起石块
- and flaunt them to their attending females.
然后向自己的“心上人”炫耀
- Maybe each male is trying to show how strong and dexterous he is
这或许是雄江豚展示自己 强壮身体和敏捷身手的一种方式
- and that he therefore is the best father a female could have for her young.
以此来证明自己将是最好的父亲 雌江豚为了孩子就应该选它
- Successful displays lead to mating.
求爱成功后 它们便开始交配
- Even for giant rivers like the Amazon
即使像亚马逊河这般巨大的江河
- the journey to the sea is not always smooth or uninterrupted.
流向大海的过程也并非都是平缓连续的
来自《行星地球 第一季 第三集 Planet Earth S01E03 淡水》第 192 行