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1·Boundary clay layers are used by scientists to determine the rate at which an extinct species declined.

边界粘土层被科学家用来确定一个灭绝物种衰落的速度。

2·An extinct species or race of human beings, Homo neanderthalensis, associated with Middle Paleolithic tools.

作为已灭绝物种或人类种族，尼安德特人与旧石器时代中期的工具有关。

3·This is an extinct species of fish.

这是一种已经灭绝的鱼。

4·This is an extinct species of fish.

这是一种已经灭尽的鱼。

5·If you want a list of Ron Artest 'enemies, just check the extinct species list.

假如你要阿泰敌人的列表，那就往查已灭尽物种列表。

6·Australopithecus, Cro-Magnon, Neanderthal are to name but three extinct species.

南方古猿人、克罗·马尼翁人、尼安得特尔人是三种灭绝物种的名字。

7·Tentative attempts to use cloning to bring back extinct species are already under way.

用克隆手段来使灭绝动物重新回到世界上的尝试工作已经开始。

8·A technology used to develop new medical treatments might one day revive endangered or extinct species.

科学技术常常能带来新的医学疗法，有一天这些新疗法可能会拯救濒危物种，甚至重现灭绝的物种。

9·The breakage frequencies in the extinct species were strikingly higher than those in the present-day species.

这些已灭绝物种的牙齿破损发生率要明显高于现存物种。

10·Dr Manning said: the potential for this technique to gently un-pick the chemistry of long extinct species is quite breathtaking.

Manning博士说：“这项技术对于分析已灭绝动物化学特性的潜力是十分巨大的。”