In their groundbreaking work regarding complexity and the limitations of formal systems, mathematicians Gregory Chaitin and A.N. Kolmogorov force us to consider this last claim more closely.

数学家 Gregory Chaitin 和 A.N.Kolmogorov 在他们关于复杂性和形式系统的局限性的开创性工作中，迫使我们更仔细地考虑最后一个说法。

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Being one aspect of poetic formal systems, images are very important to poems and are perfect forms of poetry.

意象作为诗歌形象系统中的一个方面，其于诗至为重要，堪称诗之至境形态。

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We may also use the first-order temporal logic to set some specific formal systems for various fields of studies.

我们也能使用一阶时态逻辑，为各种研究领域建立一些特定的形式系统。

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Even with the formal systems in place in most of the developed world, it is difficult to quantify adverse events associated with marketed pharmaceuticals.

ECONOMIST: Legalising drugs

Moreover, the programme has enabled the Kingdom to create strong synergies between the formal and non-formal education systems.

UNESCO: Adult Learning and Illiteracy Elimination Programme

As our formal education systems move into the digital age, we should do so with the student and his or her learning at the center, not technology.

FORBES: Digital Learning Day Cometh