The development of PI can benefits from the progress of AI, cognitive psychology, and historical philosophy of science.

PI的完善需要不断借助人工智能、认知心理学和历史科学哲学这些领域的研究成果。

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PCNA-index(PI) in the high ligation groups were much lower than the control groups(P<0.01), while apoptosis index(AI) were higher than the control groups (P<0.01).

结扎组生精细胞PCNA增殖指数（PI）明显低于对照组（P<0.01），凋亡细胞指数（AI）明显高于对照组（P<0.01）。

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No statistically significant difference in AI/PI expression based on different survival times was observed.

胃癌细胞AI/PI的表达与肿瘤患者不同存活时间之间无显著差异。

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