nán dù xì shù
- degree of difficulty
- coefficient of difficulty
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North Island,
North Korea,
North Pole,
North Sea,
North Star,
north wind,
North Yorkshire,
northabout,
Northallerton,
Northamptonshire,
相似单词
难抵抗的,
难点,
难懂的,
难读地,
难度,
难度系数,
难断气,
难对付的,
难对付的人,
难对付地,