The late Cretaceous extinction of the dinosaurs and ammonoids was just one of the more drastic inawhole series of such recurrent extinction episodes.
在这一系列周期性物种灭绝事件里,白垩纪晚期恐龙和菊石的灭绝仅仅是其中一个比较严重的事件。
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"In the last five years, it's become more affordable and more achievable inawhole movie," says Tim Webber at UK visual effects firm Framestore, the company behind the Hepburn chocolate ad.