knotty

 Longman Dictionary of Contemporary English 5++朗文当代英语 5++LDOCE 5++朗文 5++knot·ty /ˈnɒti $ ˈnɑːti/ adjective  1  DIFFICULTdifficult to solve 难以解决的 a knotty problem 棘手的问题2. TIknotty wood contains a lot of hard round places where branches once joined the tree 〔木头表面〕多节(疤)的

knot·ty adjectiveChineseSyllable  

knotty
knot‧ty /ˈnɒti $ ˈnɑːti/ adjective
1. difficult to solve:
    a knotty problem
2. knotty wood contains a lot of hard round places where branches once joined the tree

knottyBrE /ˈnɒti/ 🔊NAmE /ˈnɑːti/ 🔊 adjective (knot·tier, knot·ti·est) complicated and difficult to solve 复杂的；难以解决的；棘手的 SYN thorny ◆a knotty problem棘手的问题having parts that are hard and twisted together 有节的；缠绕在一起的◆the knotty roots of the old oak tree盘根错节的老橡树根