serration相关的词根或词缀是: serr

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No serration pattern or hesitation marks .

没有锯齿或不连贯的痕迹。

A research on cracked failures of fir-tree serration in aeroengine turbine disc .

航空发动机涡轮盘榫齿裂纹故障研究。

Tighten the internal serration screw on the exhaust sprocket .

拧紧排气链轮上的内角螺钉。

Serration marks are consistent with the saw you found at the scene .

锯痕和你在现场找到的锯子吻合。

Unifoliate each other is unripe , elliptic or shape pouring egg is elliptic , grow 2-6cm , whole reason or have extremely serration .

单叶互生，椭圆形或倒卵状椭圆形，长2-6cm，全缘或有极细齿。