The principle purpose of the dissertation is to research the evaluation system of real estate market.

本文的主要目的是研究和建立房地产市场的评价体系，并进行实际应用。

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It may be a passion about a problem, a purpose, a principle, or a group of people.

这或许是一份对某问题、某个目的、某个原则、某个群体的热情。

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He understood American power, in all its complexity, and believed that when it is applied with purpose and principle, it can tip the scales of history.

WHITEHOUSE: Remembering Richard Holbrooke

The main purpose of thought experiments, though, is to show that a problem is soluble in principle and so to encourage others to try to solve it in practice.

ECONOMIST: The universe, it appears, may not be alone