这块长2.4米的头骨来自于凶猛的史前食肉动物——上龙，该上龙从前端到尾部可能长达16米，重达12吨。
The skull from the ferocious prehistoric predator the pliosaur is 2.4 metres long and could belong to a creature measuring up to 16 metres in length from tip to tail and weighing up to 12 tonnes.
正规变化重尾分布的尾部指数的估计方法有很多种，但都不同程度地存在一定的局限性。
The estimation of tail index for regular variation heavy-tailed distributions aroused our concern, many scholars proposed several methods, but all of them have some disadvantages.
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