So two dogs, raised in the same household, exposed to the very same things, one may develop, say, a debilitating fear of motorcycles, or a phobia of the beep of the microwave, and another one is going to be just fine.
比如两只狗在一个家庭里长大， 接触相同的环境， 一只可能对摩托车产生强烈畏惧， 或对微波炉的【叮】声感到恐惧， 而另一只可能就很正常。