premonitory造句

1、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。

2、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？

3、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。