She was cautious of strangers.
她对陌生人很警惕。
However, people tend to be cautious of strangers now, in that they are afraid that helping others would put them into trouble.
然而，现在很多人都对陌生人提高警惕，因为帮助陌生人可能会让我们自己惹上麻烦。
It's likely that the effect of a thank you on prosocial behavior is more powerful on people we don't know, because strangers are more cautious about helping each other in the first place.
表示感谢的行为可能对陌生人的亲社会行为影响更大，因为人们首次帮助陌生人时会更谨慎。
It's likely that the effect of a thank you on prosocial behavior is more powerful on people we don't know, because strangers are more cautious about helping each other in the first place.
表示感谢的行为可能对陌生人的亲社会行为影响更大，因为人们首次帮助陌生人时会更谨慎。
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