恶作剧是发生在一个毫无戒备心的受害者身上的诡计，让他或她很尴尬或难堪。
A practical joke is a trick that is played on an unsuspecting victim to make him or her look silly or embarrassed.
曾经被捕获的鸟儿似乎对特定的科学家戒备心更强，要再次抓获它们的难度也更大。
Previously trapped birds seemed more wary of particular scientists, and often were harder to catch.
他人在讲话时要真心倾听，不要有戒备心或者心烦意乱，总试图想着自己怎么回应他人。
Truly listen when they are speaking and avoid getting defensive or becoming distracted with trying to think of what you're going to say in return.
但也会让没有戒备心的人误以为，既然当地绝大多数时候空气质量状况指标为绿色，那么他们呼吸的空气基本上就是安全无害的。
But it might also lead the unwary to assume, if most days in the place he inhabits are green, that the air he is breathing is basically safe.
就是能够，从一个个人的角度聊问题，而如果你很紧张就很难做到这一点，很有戒备心的时候就很难，所以我能够，有Saed是非？
Just being able to keep saying from a person's perspective which is very hard to see when you get very tense and very defensive.
她在各个方面都很专业，但有时也会放下戒备，流露出强烈的同情心和古灵精怪的幽默感。
She is professional in all respects, but occasionally relaxes her guard to let her strong compassion and quirky sense of humor show.
华盛顿和纽约都加强了安全戒备。国土安全部部长纳波利塔诺敦促美国人要有警觉心，举报可疑的活动。
Security has been increased in Washington and New York. Homeland Security Secretary Janet Napolitano is urging Americans to be vigilant in reporting suspicious activity.
华盛顿和纽约都加强了安全戒备。国土安全部部长纳波利塔诺敦促美国人要有警觉心，举报可疑的活动。
Security has been increased in Washington and New York. Homeland Security Secretary Janet Napolitano is urging Americans to be vigilant in reporting suspicious activity.
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