N a blunt weapon, often made of hard rubber; bludgeon (硬橡胶制)钝武器; 大头短棒
V to hit with such a weapon, esp on the head 用短棒击(头)
V
N hyperbolic cosine; a hyperbolic function, cosh z = (e + e), related to cosine by the expression cosh iz = cos z, where i = √–1 返回数的双曲线余弦
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