短语词组短语preventable looseness 防松looseness factor 松散因数;松度系数;放宽系数Looseness Compression 无损压缩looseness fracturing 压胀松动tissue looseness 组织疏松looseness detail 宽松状态center looseness 中心疏松looseness teeth 松动牙joint looseness 接头松动 返回 looseness