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The difference between "fluctuate" and "ebb and flow"?

The sentence is:
Because foreign exchange rates ebb and flow/ fluctuate, it is not always possible for exporters to know how much money they will receive from sales.
The answer is fluctuate. Can you explain why?

For learning: English
Base language: English
Category: Language


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    Best Answer - Chosen by Voting
    "Ebb and flow" is like the action of ocean tides. They're regular and predictable. "Fluctuate" means to change slightly, but this is not predictable.

    Because the results are uncertain, the correct answer is "fluctuate".

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