Utility is a subjective evaluation, a ranking by the individual, and there is no measurement, no extension, and therefore no way for it to be proportional to itself.

效用是主观性的评价，由当事人自己决定，无从衡量，无从延伸，也因此无从让它与自己成比例。

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Utility is a subjective evaluation, a ranking by theindividual, and there is no measurement, no extension, and therefore no way forit to be proportional to itself.

效用是主观性的评价，由当事人自己决定，无从衡量，无从延伸，也因此无从让它与自己成比例。

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The measurement of high frequency dynamical flow in dynamical test of electro-hydraulic proportional valve and electro-hydraulic servo valve is very difficult.

在电液比例阀和电液伺服阀动特性测试中，高频动态流量的测量一直是一个难题。

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