You can also have facilitated diffusion, where the movement is still down the concentration gradient but special carrier proteins are required to enable the movement.

你还可以促进扩散运动仍然沿着浓度梯度下降，但需要特殊的载体蛋白质来实现运动。

Glucocorticoids are not soluble in water, so most cortisol in the blood is bound to a special carrier protein, called cortisol-binding globulin, and only about 5% is unbound or free.

糖皮质激素不溶于水，所以血液中的大多数皮质醇是和一种特殊的载体蛋白“皮质醇结合球蛋白”结合，只有5%左右是未结合或游离的。