nán dù xì shù
- degree of difficulty
- coefficient of difficulty
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copper-asbestos,
copperband,
copper-bath,
copper-bearing,
Copperbelt,
copper-beryllium,
copperbottom,
copper-bottomed,
copper-clad,
copper-coated,
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,