An American woman swam across the English Channel four times in a row and set a new world record.
Sarah Thomas is a professional swimmer and a cancer survivor. 
Her swim took 54 hours to complete.
A strong tide in the English Channel increased the distance by 60 percent.
Professional athlete Lewis Pugn tweeted that Thomas broke the limit of human endurance.
Endurance is the ability to do something difficult for a long time.
it is also the ability to deal with pain and or suffering that continues for a long time.

 動画発行元:VOA Learning English