短語詞組短語general lower secondary level 普通初中filled lower defect level 滿充低缺陷能級implicit lower narrative level 隱式低敘述層次lower -level women 下層女性Lower Cost Level 降低成本水平LFL Lower Flight Level 低飛行高度lower r level lifetime 下能級壽命lower income level 收入水平低 返回 lower level