由于卤化银颗粒有特殊的光敏感性，使得对其表面精细结构的观察受到很大的限制。
The observation of the morphology of the silver halide crystal surface was limited because of the light sensitivity of silver halide grains.
但海砂的粒度比较粗，颗粒形状比较规则、结构比较致密、表面比较光滑、硬度和熔点都比较高，使它的用量受到一定限制。
But owing to its coarser grain, denser structure, smoother surface, higher hardness and melt point, so its proportioning rate was limited.
尽管大学英语四级考试测试的效度已被证明，但因为全国范围的大规模限制，无论从其表面效度、结构效度、内容效度还是同期效度上，都不能说它适合测量应试者的英语交际能力。
Obviously, though the validity of it has been proved, CET-4, which is limited by its large scale, is not an appropriate test for the purpose of testing communicative competence.
尽管大学英语四级考试测试的效度已被证明，但因为全国范围的大规模限制，无论从其表面效度、结构效度、内容效度还是同期效度上，都不能说它适合测量应试者的英语交际能力。
Obviously, though the validity of it has been proved, CET-4, which is limited by its large scale, is not an appropriate test for the purpose of testing communicative competence.
应用推荐