According to the character of the surfaces of a propagating crack, the balance equations are material rate equations.

根据扩展裂纹表面的特征，平衡方程是实质率型方程。

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Of course, he does not read every piece of material at the same rate, but whether he is reading a newspaper or a chapter in a physics text, his reading rate is relatively fast.

当然，他并不会以同样的速度阅读每一篇材料，但无论是阅读报纸还是物理文本中的一章，他的阅读速度都是相对较快的。

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Using them wisely in the classroom, for instance, increases the rate of learning and learned material retention.

比如说，在教室里明智地使用它，会提升学习中的和已学过的材料的保持率。

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Texas, the biggest of the U.S. material boys, boasts an unemployment rate around 6%, well below California (nearly 10%) and New York (8%).

FORBES: The Real Winners Of The Global Economy: The Material Boys