肛管与直肠粘膜相结合处，有一条锯齿状的线叫齿线或梳状线。齿线距肛缘约2.5cm，位于内括约肌中部或稍低，男性平前列腺尖端，女性与会阴体齐高。
锯齿线 APTOS ; jaggies ; QuillTM SRS ; zigzag line
齿线偏移量 [机] Offset of tooth trace
渐开线齿轮 [机] involute gear ; Involute tooth gear ; involute curfe ; involute cylindrical gear
锯齿线悬吊提升 Thread lift
齿状线 [解剖] pectinate line ; [解剖] dentate line ; dental line ; [解剖] linea dentata
色带齿线槽 Wiring duct slotted
圆齿线 Shaggy round
粗齿线槽 VDRF
齿线槽 Wiring duct slotted UL listed
除此之外，具有曲线型齿线之齿轮在运转时亦不会产生轴向的推力。
Moreover, a gear pair with curvilinear - tooth traces operates without axial thrust force.
洁齿线：一种上蜡或未上蜡的用于去除牙齿上的食物残碴和牙斑的线。
Dental floss: a waxed or unwaxed thread used to remove food particles and plaque from the teeth.
直肠癌是指齿线至直——乙状结肠交界处之间的癌肿，是消化道最常见的恶性肿瘤之一。
Cancer refers to the teeth straight line-at the junction between the sigmoid colon cancer, digestive tract is one of the most common malignant tumor.
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