yù​jǐng

early warning

预警 預警 yù​jǐng
early warning noun
to warn in advance; a preliminary warning

Early warning signs are changes that happen just before or at the very beginning of an asthma attack.

warning signs
warning signs or symptoms appearing before an event occurs

Frequency

Movie subtitles
2.21 per million appears in 1% of films
Written text
13.3 per million

Sources