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Through the use of scientific method it has been demonstrated that unsanitary conditions cause the spread of diseases.

Why the writer could not use By instead of Through?

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Basically, the writer could have used any of the following:

  1. By means of scientific method...
  2. By applying scientific method...
  3. By using scientific method...
  4. By way of using scientific method...

But "through" implies a action that has a start point and an end point which means that the scientific method helped all the way through and wasn't just a means, a resource or an instrument.

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