Exact(3)
Reforms along these lines were gradually introduced, but some formidable obstacles proved impossible to surmount.
Thanks to advances in mountaineering equipment and the indefatigable efforts of Sherpa guides, more climbers than ever are reaching the peak of Mount Everest - a landmark that was once believed to be impossible to surmount.
If you sit with it for too long it becomes a weight on your chest that feels impossible to surmount".
Similar(5)
"The economic disruption would be huge and there are environmental hurdles which it may prove impossible, or very time‑consuming to surmount," he said.
"The economic disruption would be huge and there are environmental hurdles which it may prove impossible, or very time-consuming to surmount," Sir Howard said.
"The economic disruption would be huge and there are environmental hurdles which it may prove impossible, or very time-consuming to surmount," Sir Howard says in the commission's report.
Adding in superdelegates brings Clinton's pre-New York total to 1,758 delegates and Sanders to 1,076 -- a deficit that was already nearly impossible for him to overcome, but one he hopes to surmount by winning the pledged delegate count and swaying the superdelegates to come his way.
Another Senate rule, which applies whether reconciliation is used or not, requires that the reforms enacted now not cause an increase in the deficit for decades to come, a difficult but probably not impossible hurdle to surmount.
Related(1)
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com