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

Synonym: complicatednesscomplicationtortuousness