4,The lakes near my house I have played on the ice for two weeks
stiffen的意思柯林斯英汉双解大辞典stiffen /?st?f?n/ TEM4 [ stiffening stiffened stiffens ]1.不及物动词 If you stiffen, you stop moving and stand or sit with muscles that are suddenly tense, for example because you feel afraid or angry. 僵住例:Ada stiffened at the sound of his voice.听到他的声音,艾达僵住了。选 A froze再看看别人怎么说的。