Englishfor English speakers
rental
Noun
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A rental is something that is rented.
We moved into a rental unit when we lived in Europe.
The price includes accommodation and car rental.
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Rental is the money paid for rent.
Parking spaces were set at an annual rental of $300.
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# Rental is the act of renting something.
You need ID to do the rental.
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.