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
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
In these murky waters they rely on sonar to navigate and hunt. 它们利用回声定位 在昏暗的水中探路和捕食
and in the breeding season there is stiff competition for mates. 在繁殖季节 会有一场激烈的求偶竞赛
The Amazon is so large and rich in fish 亚马逊河养育着丰富繁多的鱼类
These botos are huge - two and a half metres long. 这些亚马逊江豚体型巨大 身长达2.5米
and its marine-like forests of sponges 再加上海底森林一般的海绵
400 miles long and over a mile deep, Baikal contains one fifth of all the fresh water found in our planet's lakes and rivers. 贝加尔湖长400英里 深度超过1英里 其中淡水储量占到了全球江河湖泊淡水总量的1/5