Unlike a Warning Letter, an Untitled Letter is issued by the FDA when there is no immediate danger for patients' health if the deviations observed are not corrected immediately.

与警告信不同，当发现的偏差不立即改正不会对患者健康造成直接危害时，FDA就会签发无标题函。

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Japan Meteorological Agency immediately issued a tsunami warning, said the earthquake will lead to about 6 meters high tsunami.

日本气象厅随即发布了海啸警报，称地震将引发约6米高海啸。

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Knowing that the atmosphere could produce a strong tornado, they immediately issued the tornado warning as soon as the Doppler radar started to show low-level rotation within the storm.

CNN: The making of a nightmare tornado