There came a day when the first premonitory blast of winter swept over the city.

天，预示严冬即将来临的第一阵寒流侵袭了城市。

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What premonitory signs and symptoms may exist for vasovagal syncope? 1.

血管迷走神经性晕厥出现的先兆症状和体征有哪些？

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Since it is a rare disorder, it is difficult to say what the premonitory symptoms are.

由于这是一种罕见的病症，我们很难说清楚它的初期症状。

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Dr. Goadsby and colleagues at UCSF are conducting more imaging studies to determine what brain activity occurs during the premonitory phase.

WSJ: Stopping a Migraine Before It Starts

It could be that physiological changes in the premonitory phase trigger a sensitivity to such foods, rather than the other way around.

WSJ: Stopping a Migraine Before It Starts

Experts also think that they can learn a lot about the origin of migraines by studying how the body changes in the premonitory phase.

WSJ: Stopping a Migraine Before It Starts