Englishfor English speakers
sum
Noun
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A sum is an amount of money, usually a large amount.
The company had been spending large sums on publicity and advertising.
It allows the corporation to pay its workers a lump sum of up to £37,000 on leaving.
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The sum is the total of adding or subtracting several numbers or amounts.
The total output doesn't equal the sum of the inputs because the system is not 100% efficient.
The sum of the three numbers will always equal 10.
sum
Verb
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If you sum up, you conclude or bring together the main points.
She sums up the situation by saying that the new family is never the same as the biological family.
complex
Adjective
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If something is complex, it has lots of parts or pieces, or is difficult to understand.
He has constructed a complex computer system to send translated messages between humans and dolphins.
A complex problem that we face today is poverty, especially in Africa.
complex
Noun
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A problem.
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A group of buildings with a common purpose, such as a university or military base.
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A psychologically based dislike or fear of a particular thing.
Jim has a complex about working for a woman boss.
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A thunderstorm that forms when two storm fronts collide.
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A structure with a central atom or molecule that has a weak connection to atoms or molecules around it.