单词：serration
[医] 锯齿形, 锯齿构造
n. a row of notches
n. a single notch in a row of notches
serration的用法和样例：
词汇搭配
- external serration外细齿
- involute serration渐开线锯齿
- internal serration内细齿,三角形内齿...
- taper serration斜锯齿形,锥形键...
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