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来源：雅诚德英语网
But rock art also has a practical value for researchers and let's start by considering why that is.
但岩石艺术对研究人员来说也有实用价值，让我们先来看看为什么会那样。
But rock art also has a practical value for researchers and let's start by considering why that is.
但岩石艺术对研究人员来说也有实用价值，让我们先来看看为什么会那样。