If taking use of price to measure quality growth directly, there will be some errors. Fortunately, the quality Engel curve gives us a useful tool and good viewpoint to estimate the quality growth.

如果直接用价格来衡量品质升级就会有所偏差，而品质恩格尔曲率则提供了一个良好的研究工具和研究视角。

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Practical Rational "is an expression on thinking mode of the value measure of pre-Qin Confucianism, which gives priority to Good over True."

“实践理性”是先秦儒学以善统真价值尺度在思维方式上的体现。

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Earth's magnetic field gives the planet and its inhabitants a good measure of protection, but with space agencies seemingly intent on sending astronauts to the Moon and even to Mars in the next few decades, there is a pressing need for a fuller understanding of the Sun's activity.

BBC: NEWS | Science/Nature | Spacecraft go to film Sun in 3D