手工艺品没有形状，也不对称，制作无方，质量低劣。

In its handicrafts there is no form or symmetry, method or quality.

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在曲线处的内轨和外轨通常打磨成不对称的形状，目的是改善共形接触，增大内外车轮滚动圆的直径差，利于导向。

Curves generally are ground with asymmetric profiles that promote conformal contact in order to take advantage of the rolling radius difference and enhance steering.

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有斜切模型的喷管形状不对称，内流在出口处产生的扰动在较长一侧喷管壁反射，出现激波现象，引起流动的变化。

Because nozzle shape with oblique cut models is asymmetric, the disturbance produced at the exit of nozzle is reflected on the longer side and causes shock waves in the inner flow.

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