Presently the sun emerged.

俄而日出.

《现代汉英综合大词典》

It was sunny just now, and the next moment a rainstorm came.

刚才明明还是晴天, 俄而暴雨骤降.

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Suddenly, heavy footsteps roused him from his reverie.

俄而沉重的脚步声惊醒了曾沧海的沉思.

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Suddenly , his hand twitched again, and his eyelids fluttered a moment and then remained half closed.

俄而手又一动, 眼皮有点跳,终于半睁开了.

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