warn：
v. 提醒注意(可能發生的事);使警惕;勸告(使有所防備);警告;告誡
第三人稱單數： warns
現在分詞： warning
過去式： warned
過去分詞： warned
例句：
The computer is programmed to warn users before information is d.
這臺計算機編程時已設計在信息刪除前提醒用戶。
People were swimming in the ocean despite the hurricane warning.
盡管有颶風警報，人們仍然在大海里游泳。
She was warned that if she did it again she would lose her job.
她被警告說如果她再這樣做就會丟掉工作。
He called out a warning from the kitchen.
他在廚房里大聲發出警告。
She had ignored the warning signs of trouble ahead.
她沒有理會警示前方危險的標志。
Doctors issued a warning against eating any fish caught in the river.
醫生發出警告不要吃在那條河里捕的魚。
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