She thought she needed to explore the limits of her endurance, and she suspected the exploration would be a long one.

她认为她需要探索一下她的耐久力的限度，她怀疑这探索会花很长时间。

youdao

He knew the limits of his endurance.

他知道自己耐力的极限。

youdao

If you wish to win at the Olympic Games, to prepare yourself properly you would have to follow a strict regimen that stretches you to the limits, of your endurance.

如果你想要在奥林匹克比赛获胜，就要做好适当的准备，你一定得遵循一套把你拉到忍耐极限的严厉制度。

youdao

These stories, and others concerning extraordinary feats in extreme cold, at great depths underwater, in sporting arenas and in outer space, are the starting points for Dr Ashcroft's careful explanations of how the human body copes at the limits of endurance.

ECONOMIST: The science of survival

Amid all this, Dr Ashcroft develops an amusing recurring theme about the willingness of physiologists over the years to perform experiments on themselves in order to advance their understanding of the limits of human endurance.

ECONOMIST: The science of survival

It was an experiment that tested the limits of human endurance, with the aim of making transportation safer.

BBC: Before Baumgartner: Five daredevils who helped science