region mask区域掩模regionn.地区；范围；领域；地带；地域region of stable values稳定值区regiones supraorbitalis[医] 眶上区region potential energy区位势能regiones colli anterior[医] 颈前区region of humid tropics湿润热带地区regiones hypochondriaca[医] 季肋区region of high activity强放射性区region growing variance最小类内方差regiones dorsaiis pedis[医] 足背区region variance feature可变区域特征