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N-COUNT
(口頭或書面的)警告，警示
A warning is something which is said or written to tell people of a possible danger, problem, or other unpleasant thing that might happen.
例句
The minister gave a warning that if war broke out, it would be catastrophic...
部長警告說，戰爭一旦爆發將會是災難性的。
He was killed because he ignored a warning to put stronger cords on his parachute...
他忽視了降落傘上要求使用更結實的繩索的警告信息，因而命喪黃泉。
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N-VAR
預告;預兆
A warning is an advance notice of something that will happen, often something unpleasant or dangerous.
例句
The soldiers opened fire without warning...
士兵們在沒有發出警告的情況下開了槍。
With no warning, he was fired from his job...
他沒有受到任何警告，就被解雇了。
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ADJ
警告的;告誡的
Warning actions or signs give a warning.
例句
She ignored the warning signals...
她忽視了一些預警信號。
Some fog warning signs had been put up with flashing yellow lights.
一些配有黃色閃光燈的大霧警示標志立了起來。