名词难题,纠纷,困难
1. 困难:knottily 有结地 | knottiness 困难 | knotting 结形花边
2. 枝节:正应力 normal stress | 枝节 knottiness | 枝梢材 faggot wood;lop and top;lapwood
3. 多节/纠纷/困难:knotter /结筛/打结器/除节机/ | knottiness /多节/纠纷/困难/ | knotty /有结的/多节的/多瘤的/棘手的/
noun
1. puzzling complexity