The gradation and norm are two categories which reflect the law of unity of opposites in nature and human society.

级次与标准是反映自然界、人类社会各个方面对立统一规律的两个范畴。

youdao

The fractal esthetics has been proposed as a new essential law of nature in beauty in form of building that surpassed the conventional law of unity and variety.

提出分形美学是超越传统的统一与变化原则的全新的建筑形式美的基本法则。

youdao

The law of the unity of opposites is the fundamental law of the universe.

对立统一规律是宇宙的基本规律。

《新英汉大辞典》

After the first post-dictatorship democratic elections in 1999, 12 of the northern Muslim states adopted sharia law, putting an enormous strain on the unity of a Nigerian state that had previously been run only under the secular, civil law bequeathed to it by British colonial rulers.

ECONOMIST: Nigeria

Officials said those attending Friday's meeting hope to reach an agreement on the formation of a new national unity government and electoral law, which should lead to parliament's election of a president.

CNN: Hezbollah lifts Beirut street blockades

We will engage as partners as the Libyan people work to build open and transparent institutions, establish security and the rule of law, advance opportunity, and promote unity and national reconciliation.

WHITEHOUSE: Statement by the President on Libya