ENPV的全称：Expected Net Present Value | 中文意思：───预期净现值；期望净现值
ENPV的全称：External Negative Pressure Ventilation (pulmonary disease) | 中文意思：───外负压通气(肺疾病)
ENPV的全称：Economic Net Present Value | 中文意思：───经济净现值
