1·Geometry and quantum field theory, designed for mathematicians, is a rigorous introduction to perturbative quantum field theory, using the language of functional integrals.
几何和量子场论课程是用泛函积分的语言对微扰量子场论的严谨的介绍，主要针对数学家设计。
2·Duality invariance is the core of the space theory of functional analysis.
对偶不变性结果是泛函分析空间理论的核心内容。
3·The oscillation of neutral functional differential equations has important implications in both theory and application.
中立型泛函微分方程的振动性在理论和应用中有着重要意义。
4·Aim To study a class of boundary value problem of hyperbolic partial functional differential equations with continuous deviating arguments.
目的研究一类具有连续偏差变元的双曲偏泛函微分方程边值问题解的振动性。
5·When interface is imperfect, its effect on energy functional of composite with it, which emerges in form of interface integral items, must be calculated.
当界面非完美时，复合材料的能量泛函必须计入非完美界面效应，该效应以界面积分项形式出现。
1·Bathrooms don't have to be purely functional.
浴室不必完全只为了实用。
—— 《牛津词典》
2·Their furniture was more aesthetic than functional.
他们的家具美观多于实用。
—— 《牛津词典》
3·The office was large and functional rather than welcoming.
这个办公室大而实用，但不怎么宜人。
—— 《牛津词典》
4·The chairs were comfortable, functional, and free of ornamentation.
这些椅子舒适实用，而且看上去不花哨。
—— 《柯林斯英汉双解大词典》
5·Their clothing is primarily functional and only secondarily decorative.
他们的衣服首先重实用，其次才讲花式。
—— 《牛津词典》