v.使 ... 堅硬；變?yōu)闈庹常皇箞远ǎ皇箯娪?/p>

This lignification serves to stiffen and strengthen the cells. 木質(zhì)化足以使細(xì)胞變硬和增強。

This sort of grease could not stiffen when the temprature drops. 溫度下降時，這種潤滑脂不會變稠。

He stiffened at the insult. 他聽到這些侮辱的話，態(tài)度強硬起來。