They have to cut step in the ice as they climb .
他们往上爬时得在冰上凿出踏脚处。
Romberg sign:闭目难立征
行走时步态不稳,二足分开,看着地面行走,举脚高、着地重,自觉如踏棉花,黑暗处行走更难. 当骶段后根损害后,出现括约肌功能障碍,排尿无力淋漓不尽等. 查体时下肢肌张力减退,深感觉丧失和腱反射消失,闭目难立征(Romberg sign)阳性.