短語詞組短語average energy level 平均能級average gray level 平均灰度Average Credit Level 平均信用水平Average development level 平均發(fā)展水平average advanced level 平均先進水平average signal level 平均信號電平average picture level 平均圖象電平average quality level 平均質(zhì)量水平the average educational level 平均受教育年限 返回 average level