основе

основе

"Основе" means "basis" or "foundation."

The phrase 'на основе' indicates that the story was created using an ancient legend as a foundation or base.

Этот рассказ был написан на основе старинной легенды.

This story was written based on an ancient legend.

The usage 'на основе' again signifies 'using as a basis or foundation,' emphasizing that the research served as the groundwork for the conclusion.

На основе их исследований был сделан вывод.

Based on their research, a conclusion was made.

Here, 'в основе' means 'at the core' or 'at the fundamental level,' referencing the structural essence of the chemical substance.

Химическое вещество изменилось в основе своей структуры.

The chemical substance changed in the core of its structure.