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Performance-critical systems
,这一点在电影中也有详细论述
self._on_changes.append(on_change)
It points out that when the first UK Birds of Conservation Concern Red List was published in 1996, it contained only one species of seabird. Today, ten of the UK's 25 breeding seabird species are on the Red List, among them the puffin and the kittiwake.
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