我们需要注意这个观点，即艺术的发展是在一条直线上发生的，表现形式从简单到复杂。

We need to be careful with the idea that artistic development occurs in a straight line, from simple to complex representations.

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我们必须经历由简单到复杂的阶段。

We must proceed by stages from the simple to the complex.

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在许多实例中，这些类别沿着从简单到复杂的演进路径或层次下降。

And, in many instances, the categories fall along an evolutionary path or hierarchy that proceeds from the simple to the complex.

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