The late Cretaceous extinction of the dinosaurs and ammonoids was just one of the more drastic in a whole 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。
That telephone call set in train a whole series of events.
那个电话把一整套事项安排好了。
The incident sparked off a whole series of events that nobody had foreseen.
那一事件引发出一连串谁都没有料到的事。
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