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The missing link had to be what Charles Darwin called a transitional form.
進化缺環(huán)必須是達爾文所謂的“過渡型物種”
These lie at the very heart of his Theory of Evolution because they show how one animal can mutate into another.
它們是進化論的核心，因為它們表明一種動物能夠進化成另一種動物
Transitions occur in evolution when there is a dramatic environmental change.
進化史上的演變通常發(fā)生在環(huán)境劇變時期
Creatures that cannot adapt to the new environment die out.
無法適應新環(huán)境的物種滅絕了
but chance mutations often turn out to be the key to survival.
可是偶然的突變卻往往成為生存的關鍵
There is an explosion of bizarre forms as a host of mutants experiment with living in the new environment.
新環(huán)境中有如此多的生存突變試驗，勢必造成了各種奇怪物種的大爆發(fā)
These freaks of nature will die out quickly and just some will become transitional forms,
這些大自然的畸形兒很快便消亡了，只有一部分成為了過渡型物種
creatures that are half one animal and half another which bridge the old way of living and the new.
它們一半是一只動物，一半是另一只動物，在新舊生存方式之間架起了橋梁
Transitional forms are the most crucial fossils in all evolution.
過渡型物種是所有進化中最關鍵的化石物證
They're important to the zoologist, to the palaeontologist because they,
它們對動物學家和古生物學家來說非常重要
they show you what the process actually was.
因為它們表現(xiàn)了進化的過程，
I think they're very important to the public as,
我認為它們對大家來說都很重要
as being direct evidence that there was a process of change that you can document.
因為它們是你用以證明演化過程的直接證據(jù)
