About 550 years ago, a German man made a machine that could print books very fast.
大约在五百五十年前，一名德国人制造出了一部可以快速印刷书本的机器。
Whatever Grypania was, it was one of the few known examples of complex life until about 550 million years ago, when the fossil record explodes in diversity.
无论卷曲藻属于何种类型，它是在5.5亿年前出现的化石记录大爆炸之前已知仅有的几类复杂生命体的案例。
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