The lifeguard warned the swimmers about the strong currents.
（救生员警告游泳者注意湍急的水流。）

My mother always warns me not to stay up too late.
（我妈妈总是警告我不要熬夜太晚。）

The sign on the door warns people not to enter without permission.
（门上的标志警告人们未经许可不得入内。）

The teacher warned the students that there would be a difficult test next week.
（老师警告学生们下周会有一场难度较大的考试。）

The weatherman warned of an approaching storm.
（气象员警告即将有暴风雨来临。）

He warned her not to trust that man easily.
（他警告她不要轻易相信那个人。）

The doctor warned him about the side effects of the medicine.
（医生警告他这种药的副作用。）

Parents should warn their children about the danger of talking to strangers.
（父母应该警告孩子与陌生人交谈的危险。）

The police warned the public to be vigilant against theft during the festival.
（警方警告公众在节日期间要警惕盗窃。）

She warned her friend not to make the same mistake again.
（她警告她的朋友不要再犯同样的错误。）

The warning label on the product warns users of potential hazards.
（产品上的警告标签向用户警示潜在的危险。）

The coach warned the players that they needed to train harder if they wanted to win.
（教练警告队员们，如果他们想赢，就需要更刻苦地训练。）

They warned us that the road ahead was blocked.
（他们警告我们前面的路被堵住了。）

The environmentalist warned of the serious consequences of deforestation.
（环保主义者警告了森林砍伐的严重后果。）

The old man warned the kids not to play near the river.
（老人警告孩子们不要在河边玩耍。）

The security guard warned the trespasser to leave the premises immediately.
（保安警告擅自闯入者立即离开该场所。）

The report warns of the increasing threat of cyber attacks.
（报告警告网络攻击的威胁日益增加。）

My father warned me about the importance of being honest in life.
（我父亲告诫我在生活中诚实的重要性。）

The notice warns employees to arrive on time for work.
（通知警告员工要按时上班。）

The experienced hiker warned the beginners about the difficulties of the trail.
（这位经验丰富的徒步旅行者警告新手这条小径的艰难之处。 ）