difficult to understand or solve
... 及动］使迷惑，难住 bewilder 使困惑,使迷惑 perplex 使迷惑的 difficult to understand or solve; puzzling ...
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Difficult to understand or solve;puzzlingly intricate.棘手的很难理解或解决的;令人困惑地错综复杂的 Labyrinth(maze)：System of intricate passageways and blind alleys.
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difficult to understand or solve
难以理解或解决的
以上为机器翻译结果，长、整句建议使用 人工翻译 。