My homework

腿软无力（要WALKER铺助）走半个街口就要休息。==> My legs are weak and I have to use a walker. Still, I have to stop and rest after about half a block. 

眼力差（患白内障）看不清车站牌 ==> My vision is poor with cataract and I cannot see the stop names clearly. 

记忆力差（不能清楚记得医生诊室需要的下站的地点，有些地点还要转车）==> My memory is failing and I cannot remember which stations to get off. I need to transfer to get to some doctors' clinics.