An arc of all seven spectral colors appearing in the sky opposite the sun as a result of the refractive dispersion of sunlight in drops of rain or mist.
由于雨滴或雾滴对阳光有折射分光作用，使空中太阳对面出现的一道有七色光谱的弧。
The operating principle and the structural features of the newly developed opposite-V type of A. C. arc welding transformer are analyzed in this paper.
本文分析了当前出现的三相输入单相输出式交流弧焊变压器的工作原理及结构特点。
The opposite surfaces of the two anchor ears are arc-shaped surface.
两抱箍的相对面均为 弧形面。
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