我们必须避免类似20世纪80年代那样破坏性的繁荣-萧条周期。
We must avoid the damaging boom-bust cycles which characterized the 1980s.
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。
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.
20世纪20年代末和30年代初，美国和欧洲经济波动表现为典型的奥地利周期。
The US and European business cycle of the late 1920s and early 1930s was a classic Austrian cycle.
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