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。
2
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。
3
The measurement of high frequency dynamical flow in dynamical test of electro-hydraulic proportional valve and electro-hydraulic servo valve is very difficult.