Strains circulating at the end of one season's epidemic are sometimes responsible for the next season's outbreak (the so-called herald wave phenomenon).

在一个季节流感结束的时候菌株的传播可能是引起下一季流感暴发的原因(因而被称为前峰波现象)。

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Mr Llewellyn also questions the theory that building-society conversions will herald a wave of takeovers, leading to efficiency gains as overcapacity is cut.

ECONOMIST: Building societies

Second, does her victory, as the first woman to lead one of France's main parties, herald a new wave of French women at last grasping their fair share of political power?

ECONOMIST: The French Gaullists�� new lady

The apparent co-ordination of the attacks, coming so soon after Lahore and the Taliban warning, could herald a new wave of violence in Pakistani cities, says the BBC's Barbara Plett in Islamabad.

BBC: Peshawar tense in bombs aftermath