The tail of an animal is on the posterior part of the body.动物的尾巴长在身体的后部。The man squeezed his large posterior into the chair.那个男人勉强把他的大屁股挤进椅子坐下了。If you would kindly move your posterior just a fraction to the right, I might get by.如果你能把尊臀向右移一点点，我就能过去了。