train tickets to the doorsteps送票上门
N-COUNT(可数名词) A doorstep is a step in front of a door on the outside of a building. 门前台阶
...a youth who was sitting on a doorstep, drinking.
…一个坐在门前台阶上喝酒的年轻人。
PHRASE(习语) If a place is on your doorstep, it is very near to where you live. If something happens on your doorstep, it happens very close to where you live. 在住所附近
It is easy to lose sight of what is happening on our own doorstep.
家门口发生的事反而容易被我们忽视。