Teacher:In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.
Teacher: Now, understand the problem? Solve this instance: Then , Aristotle proved the Earth was round in around 330 BC .
Student:
Around 330 BC , Aristotle maintained on the basis of physical theory and observational evidence that the Earth was spherical , and reported an estimate of its circumference .