A newly discovered eel that inhabits an undersea cave in the Pacific Ocean has been dubbed a "living fossil" because of its primitive features.

一种最近在太平洋海底洞穴被发现的鳝鱼因其原始的特征而被冠以“活化石”称号。

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Instead, some features shift to the advanced form at the beginning of the process, while others stay resolutely primitive until near the end.

相反地，有些特点从最初阶段变化到高级的同时，另外一些特点却毅然停留在几乎是原始的阶段。

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They described the remains as "a surprising Mosaic" of primitive and modern features.

研究人员称该化石是兼具古猿类和现代人类双重特点“令人惊讶的综合体”。

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"There are primitive features in the skeleton of floresiensis which for me suggests that it comes from quite a primitive form of human: one that may have been around two million years ago rather than one million years ago".

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The combination of features indicates that the primitive pterodactyls evolved relatively quickly, and that certain groups of features changed at the same time.

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Instead, some features shift to the advanced form at the beginning of the process, while others stay resolutely primitive until near the end.

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