你以为会咬人就是狗啊
[nĭ yĭ wéi huì yăo rén jiù shì gŏu a]
This means “Do you think those who bite are all dogs?” It reflects on misperceptions about individuals’ behaviors or attitudes toward others. It suggests that aggression doesn't define the type of person someone is, and not everyone aggressive (or shows a negative side) is necessarily what you perceive them to be.