law of parallel variation
即同源平行变异律（law of parallel variation） 。同源平行变异律在作物选育和引种中有重要的指导意义。
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law of parallel variation
平行变分律
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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By combining with the machining needs of parallel machine tools, the working space and the law along with the variation of its autorotation Angle were studied.
结合并联机床的加工要求，研究了工作空间及其随自转角的变化规律。
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