Canvas stiffens as it dries .

帆布干时变硬。

My dad stiffens as he looks at me .

我爸爸僵硬，因为他在我的样子。

So whatever stiffens one will have the same effect on the other .

因此，无论哪里硬化，都会对其他部位产生同样的影响。

But when its sensors detect a hand coming , it stiffens , ready for action !

可是一旦它的传感器探测到一只手正在伸过来，它就会变硬，准备好工作！

When inspection the obvious cervix of the uterus has the varying degree erosion , large , sometimes stiffens , sees pathological changes and so on polyp , lacerated wound , eversion and gland cyst .

检查时可见宫颈有不同程度的糜烂、肥大，有时变硬，见息肉、裂伤、外翻及腺体囊肿等病变。