天文学家们认为，“地球是宇宙的中心”这种说法是非常直观、合情合理的，以至于当他们发现与地心论不符的现象时，也会想办法找理由去解释。

It was so intuitive, so sensible that the Earth was the center of the universe that astronomers found ways to explain those seemingly inconsistent phenomena within the geocentric view.

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从一个角度看，部分稳固论似乎是完全直观的。

Viewed from one perspective, the doctrine of mereological constancy can seem fairly intuitive.

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组合恒等式在组合数学中占有重要的地位，它有多种证法，运用集合论的观点，求导法则和概率方法对几个重要的组合等式给出了直观简洁的证明。

This paper USES the set theory, derivation principles and probability method to give a direct and simple solution to several important combinatorial identities.

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