Englishfor English speakers
crisis
Noun
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A crisis is a situation that has become very bad or very dangerous and can have bad changes to security, economic, political, societal or environmental issues.
The latest change in the hostage crisis came one day after Israel freed 51 prisoners from a jail in south Lebanon.
This will be president's last trip to the Persian Gulf until the crisis has been resolved.
The conditions of these people were extremely difficult and we faced really serious humanitarian crisis.
The US financial system is in crisis.
He has clear ideas about how to solve our energy crisis.
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A crisis is a serious emotional problem.
My high school friends thought I was confused, that I was having an identity crisis.
My dad quit his job. I think he's going through a midlife crisis.
proof
Noun
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Proof is evidence which shows something is correct.
He has proof that he was not at the crime scene. A witness says that they were somewhere else.
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A proof can show how a theorem is correct.
system
Noun
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A group of things that work together; a way of doing something.
This coloured paper is part of my system for keeping lists of people.