be on guard[英][bi: ɔn ɡɑ:d][美][bi ɑn ɡɑrd]
防范；惕励；惕历;
例句:
1.
Should I feel safe and warm and cuddly in this crowd, or do I have to be on guard?
当我身处一群人当中时，是应该感觉安全温暖，还是应该有所戒备？
be on guard
防范
双语例句
1.
How to be on guard against pickpockets and swindlers?
乘坐地铁时如何防范扒窃和诈骗行为
2.
The prince should be on guard against them and fear them as if they were declared enemies, because they will always help to bring about his downfall in adverse times.
君主应该防范他们，对他们感到害怕，把他们当作公开的敌人来对待，因为在困难时期他们总会促成他的垮台。
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