knottiness 隐藏摘要 
困难
knottily 有结地
knottiness 困难
knotting 结形花边
http://www.zftrans.com/favorite/vocabulary/2006-2/1/212706212127122877397.htm - 基于22个网页
枝节
正应力 normal stress
枝节 knottiness
枝梢材 faggot wood;lop and top;lapwood
http://www.zsfloor.com/bencandy.php?fid=9&id=94 - 基于5个网页
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