However, this change of research variance resulted in deep foundation of reality and theory.

其研究对象的变迁具有深厚的现实根基和理论基础。

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Of course, learning does vary a lot between individual students, but research reliably shows that this variance is far greater within populations of boys or girls than between the two sexes.

当然，不同学生的学习能力差异很大，但研究确实表明这种差异在男孩或女孩群体中要比在两性群体中大得多。

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This research provided techniques for the application, conservation in vitro of excellent germplasm and reduction of heredity variance of autotetraploids of Plalycodon grandiflorum.

本研究为优良同源四倍体桔梗的推广应用和优良种质离体保存、减少遗传变异提供了技术依据。

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