The immune system and other factors contribute as control factors also, altogether maintaining constant levels of hormones.

免疫系统和其他因素也作为控制因素发挥作用，共同维持激素的正常水平。

So when we, you know, so it's possible to move the craft faster than the wind, but it's not possible to move it at zero acceleration which would be needed to maintain constant speed.

因此，当我们知道时， 可以使飞行器比风更快地移动，但不可能以零加速度移动它， 而零加速度是保持恒定速度所必需的。