It's very dangerous to wave to people you don't know because what if they don't have hands? They'll think you're cocky.
向你不认识的人挥手是非常危险的，因为如果他们没有手怎么办?他们会认为你很自大。
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Dangerous
向你不认识的人挥手是非常危险的，因为如果他们没有手怎么办?他们会认为你很自大。