middle-aged

a.中年的

microscope, microscopic, microscopically, Microsoft, microwave, mid, mid-, mid-afternoon, mid-Atlantic, mid-term, midday, midden, middle, middle age, middle C, middle class, middle ear, middle finger, middle name, middle school, middle-brow, middle-distance, middle-of-the-road, middleman, middleweight, middling, midfield, midge, midget, midland, midnight, midriff, midshipman, midships, midst, midstream, midsummer, Midsummer's Day, midway, midweek,