perseverance = per(全部) + sever(严重) + ance(表名词) = 坚持不懈；不屈不挠,； 耐性；毅力
severly = sever(严重) + ly(表副词) = 严重地
While the number with the most severe challenges has gone down since 2003, the number identified as having milder problems has risen from 14% to 18% of all pupils in England in the past seven years.
The Treasury said earlier this week that it did not expect the baseline scenario stress test to lead to any additional capital requirements, but that it might be needed under the more severe test.
It is a very severe situation.
I haven't seen a reaction this severe since medical school.
Shortages of professional staff are very severe in some places.
Of course, if you already have severe depressive symptoms, then seek help right away.
My diagnosis is that you've experienced a severe anxiety attack.
Half of those surveyed say that the penalty should be as severe as that for drunk driving.
The new consciousness that there were also severe limits tohealth-care resources was part of this general revelation of the obvious.