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。
2
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。
3
Another three were on the edge of the disc, facing one side while hind limbs and tail on the other side.