What first alerted me to their presence was the shrill warning call of their lookout monkey, whose job is to warn the troupe when intruders draw near.

最先让我发觉它们存在的是“放哨”猴的尖叫声，它的职责就是在闯入者靠近时警示同伴。

youdao

Scientists call these bright colors warning colors.

科学家称这些明亮的颜色为警告色。

youdao

This is like a warning, or a call for help: "I'm being attacked!"

这就像是一个警告，或是求救信号：“我正遭到攻击！”

youdao

But now researchers led by Doctor Jonathan Winickoff at MassGeneral Hospital for Children in Boston are warning about what they call "third-hand smoke."

VOA: special.2009.01.07

He decided to call his claim "Tombstone" because of the soldier's warning.

VOA: special.2010.02.15

Of course, no sooner is he invited than he receives n anonymous phone call warning him not to go.

FORBES: A Forgotten Poe

And it ended with a veiled warning - a call for "a mechanism for monitoring and reporting on the provision and quality" of all religious broadcasting.

BBC: Church offers to re-tune

Police said they were again warning that they would call parents of unaccompanied young people found involved in suspected illegal activity.

BBC: Welsh boy's parents called after drinking in Newquay