walk-up apartment

例句：

1. 1. We decided to move into a walk-up apartment for economic reasons.
   我们决定为了经济原因搬进一个步行式公寓。
2. 2. The walk-up apartment was small but had everything we needed.
   这个步行式公寓虽然小，但应有尽有。
3. 3. Walking up the stairs is a great way to exercise and get some fresh air.
   走楼梯是一种很好的锻炼方式，也能呼吸到新鲜空气。