手扶着墙或栏杆，在楼梯台阶上尽力踮脚，脚跟慢慢降低，保持20秒，然后重复动作。

Slowly lower both heels. Hold for 20 seconds, then repeat.

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他走到楼梯口也没被人发现，于是开始像个幽灵样走下冰冷的石头台阶。

He reached the stairs unnoticed and began descending the cold stone steps, like a ghost.

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几个台阶通向一楼和楼梯井；它们底部宽，上面窄，铁扶手镶嵌到墙里面，朝外弯曲，跟街道持平。

Several steps led up to the first floor and stairwell; they were wide at the bottom, narrower above, set between walls topped with iron banisters and curving outwards at street level.

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