又称虚角，这种角由真皮形成的骨质芯与表皮形成角质鞘。洞角质地坚硬，终生不脱落，且不分叉。
鲁德尔敏感性，或从一个极端总运动，另一方面是受舵角上的漏洞，并在一定程度上，由“皮卡”洞角上了电梯。
Rudder sensitivity, or total movement from one extreme to the other, is controlled by the holes on the rudder horn and, to a degree, by the "pickup" hole on the elevator horn.
这个洞现在正在被填补起来——这归功于角鲸，一种中等大小的，北极特有的鲸，因为雄鲸长着一个螺旋纹的长牙而被称为海中的独角兽。
That hole is now being filled - thanks to narwhals, medium-size whales, endemic to the Arctic, known as unicorns of the seas because of the single, spiralling tusk found in males.
马尾藻海传奇，和它当代的替代者——百慕大三角洲应该是使东西消失无形的无底洞。
The Sargasso Sea of legend, and its modern equivalent, the Bermuda Triangle, are supposed to be places where things disappear without trace.
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