We get the characteristic of ET value on the basis of connotation, including the subjectivity, objectivity and expansibility.
论述教育技术学价值的内涵，必然涉及到主体与客体的关系。
Objective To investigate the dynamic variation of hematuria and proteinuria after exercise test (ET) and its value in the medical selection of the pilots.
目的探讨运动试验后血尿和蛋白尿变化规律以及在飞行员医学选拔中的价值。
Objective To evaluate the value of in vitro fertilization and embryo transfer (IVF ET) in the treatment of infertility.
目的评价体外授精胚胎移植（IVF ET）治疗不孕症的价值。
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