它们常常线条流畅、造型简朴，纹饰与器形高度和谐统一，并服从于实用原则。
Always with smooth lines and simple designs, the linear decoration and shape of artifacts were highly harmonious and integrated, conforming only to a pragmatic principle.
语法教学该如何开展，语法教学中的理论尺度和实用原则该如何把握，都是当前亟待探讨的问题。
Therefore, it is very worthwhile to study how to teach grammar and how to handhold the standard between the theory and the practice in teaching gram-mar.
超音速飞机的长窄三角翼型设计是美观实用原则的代表，极度的流线型设计对于将阻力降到最低是必要的。
The long narrow delta shape of supersonic aircraft is an example of aesthetic functionalism, an extreme form of streamlining that is essential to minimize drag.
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