一个直接的方法就是难度设计者花费大量的时间专注于速度分布；几何为辅。

One difficulty with direct methods is that the designer spends a great deal of time focusing on the velocity distribution; the geometry is secondary.

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分类任务的难度主要通过增加相关维度的数量、类别刺激分布的间断性和增加类别数量等方式体现出来。

The difficulties of classification tasks are expressed by discontinuous category distribution and adding relevant dimensions and category number.

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此外，时间和空间分布状况的不同也增加了评价的难度。

In addition, time and space distribution can also increase the difficulty of loss assessment.

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