1. She has run five marathons in different countries.
她已经在不同国家跑了五次马拉松。

2. Many athletes participate in marathons every year.
许多运动员每年参加马拉松比赛。

3. These marathons require months of training.
这些马拉松比赛需要数月训练。

A: How many marathons have you completed?
A：你完成过多少次马拉松？

B: I’ve completed three marathons so far.
B：到目前为止我已经完成了三次马拉松。

1) 多次长跑比赛的统称

2) 马拉松赛事的复数形式

3) 指耐力型长距离跑步活动集合

1. 马拉松比赛（复数），指多场长距离跑步赛事

e.g. He has participated in several marathons.
他参加过几次马拉松比赛。

2. 一系列耐力跑活动

e.g. These marathons attract runners from around the world.
这些马拉松吸引了来自世界各地的跑者。

noun (plural)

1. Multiple long-distance running races typically covering
42. 195 kilometers each.

Synonym: long-distance races, endurance runs