To help generate lift to keep midwater, the top of the tail extends farther back than the bottom, creating a slant along the back edge.

为了保持在水中不至于沉底，尾部的顶端比底端向后延伸，沿着后端形成一个斜面，产生提力。

youdao

Not so two walruses, all alone when we came across them lounging at the edge of an ice floe; both male and dead-weight huge, lying top and tail, comfortable, sleepy, their dignity somehow intact.

而两头海象却落落大方，它们都是雄性，体型庞大，舒服地躺在冰面上打瞌睡，而它们的优雅不减分毫。

youdao

Another three were on the edge of the disc, facing one side while hind limbs and tail on the other side.

另有三人的边缘光盘，面对一方而后肢和尾部的另一边。

youdao

It's not as gritty as the Z, but its longer wheelbase actually helps pin the tail end a bit better, so there's more grip at the very edge of the performance window.

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