Englishfor English speakers
vast
Adjective
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If something is vast, it is very, very big.
Tax rates will go up for the vast majority of the population.
The system wastes vast sums of money.
To do such work takes vast amounts of time and patience.
The army marched over the vast territories of Russia.
We saw vast improvements in their test scores.
Two boats simply wouldn't be able to find each other in these vast oceans.
Indonesia is stretches over a vast number of islands.
They're building a vast network of power lines to transport the electricity.
He has a vast collection of photos.
The building was vast and empty.
The problem is that distances are so vast.
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.
of
Preposition
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Made using.
It is a house of cards.
expense
Noun
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An expense is something for which you spend money.
Food is a huge expense for many people around the world.
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An expense is an amount of money that you spend.
If your income is less than your expenses, you have a serious problem.
The company paid all of his expenses when he was in Shanghai.
The building was repaired at great expense.
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If you do mathx/math at the expense of mathy/math, mathx/math hurts mathy/math because it makes mathy/math have less money, less time, less social status, etc.
She often makes jokes at her own expense.
We have to decide whether safety at the expense of freedom is worth the cost.