Englishfor English speakers
natural
Adjective
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Something is natural if people didn't make it.
s, plants and rocks are natural things.
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Something is natural if it's the way it usually is, without people changing it, or is a way that is not a surprise.
It's only natural for you to think that.
fluctuation
Noun
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A fluctuation is when something changes back and forth quickly.
The price of wheat stayed the same, but there were a lot of fluctuations in the price of rice.
Every time a cloud goes past, there is a fluctuation in the amount of sunshine.