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。
The practical operation verifies that the system possesses high reliability, low power consumption and easy installation, and has a practical value.
实际使用表明，该系统可靠性高，功耗低，安装方便，具有很强的实用价值。
A calculating formula for freezing time has been established. Compared with other theoretical formulas, it gives less difference from actual conditions, therefore it has a practical value.
作者建立了冻结时间的计算公式，该公式与其他理论公式相比，与事实相差很小，所以具有实用价值。
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