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one and a half miles across.
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one and a half miles across. 宽幅达1.5英里

and that he therefore is the best father a female could have for her young.
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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.
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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
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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.
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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.
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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
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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.
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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
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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.
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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