Keep an eye out for warning signs.

对警示性的迹象保持警惕。

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Compulsive lying is a disorder that develops from early adolescence and one must keep an eye out for signs of compulsive lying.

强迫性说谎是一种自青少年时间养成的错乱，我们必须随时注意强迫性说谎的迹象。

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Along with signs, they learn the importance of eye contact, and how how to stop, look and listen.

手语教会他们眼神交流的重要性，如何停顿，如何看以及如何听。

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For the first year the Newcastle team monitored bike thefts from all racks across campus for a control figure, then placed the eye signs in three locations, leaving the rest of the racks without signs.

BBC: Staring eyes 'deter' Newcastle University bike thieves

"We'll be keeping an eye out for signs of a repeat performance next year when the Earth-moon system passes through the same region of space, " Cooke said.

CNN: Bright explosion on moon visible from Earth, NASA says

Lots of middle-class liberals came from as far away as California and New York to show first-time voters how to use punch-card machines, and to keep an eye open for any signs of voter intimidation.

ECONOMIST: A contrast in vote-pulling strategy