So the dog is creating a pressure differential that effectively pulls new scents toward its nose.

所以，狗狗是在制造一种压力差，可以有效地使鼻子嗅到新的气味。

The ball's spin creates a pressure differential in the surrounding air flow, that curves it in the direction of the spin.

球的旋转产生环绕的气流气压不等，从而导致球向其旋转。

That being said though, now there's this pressure differential between the left and right side, where the left's higher than the right, which is also normal.

也就是说，现在左右边存在着压力差：左边（体循环）血压高于右边（肺循环），也是十分正常的。