This reflected a migration of truly awesome proportions . 这是一种真正骇人的人口迁移运动。
2.
He believed the native american indians were people of great worth . he also understood that the indians could not block or stop the westward movement of white people in america 他相信土著美国印第安人是有巨大价值的民族。他也了解印第安人不会妨碍和组织美国白人的向西迁移运动。
3.
The polyvinyl alcohol ( pva ) in precursor can improve the porosity and make the aperture distribution narrower . so the gels were not easily crazing when drying . simultaneously the fluorescence intensity of the dyes increased as a result of the probabilities of radiationless transitions 在先驱液中加入少量有机聚合物聚乙烯醇1 （ pva ）不仅改善了孔结构，使孔径分布窄，凝胶在干燥过程中不宜开d裂，而且使掺于其中的染料分子的迁移运动受到限制；降低了非辐射i跃迁的几率，提高了染料的荧光强度。
