The authors spent five years studying the behaviour of their 344 "exceptional companies", only to come up at first with nothing.
两位作者花了5年时间研究那344家“杰出公司”的行为，没想到起初却一无所获。
A few — such as the Blackcap — have started to adapt by spending winters in Britain, but such behaviour remains exceptional, the study said.
研究称，少数鸟类如黑顶莺等已经开始适应在英国过冬，但这种情况还只是少数。
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