单词	小腹--下腹
释义	双向☞下腹--小腹
随便看	positive degree positive density positive derail positive detection loop positive developer positive deviation positive diageotropism positive differential resistance positive direction positive-direction only energy flow positive discrimination positive displacement positive [displacement] blower positive displacement blower positive-displacement compressor positive displacement flow meter positive displacement flowmeter positive-displacement flowmeter positive displacement meter positive-displacement meter positive displacement motor positive displacement pump positive-displacement pump positive-displacement refrigerant compressor positive displacement vacuum pump