lengthilyadv.长地；冗长地lengthn.长度；时间长短；距离；一段；距离的测量单位Length calculation长度计算length of circular证明length-frequency体长频率length coefficient长度系数length for heading标题长度length of a vector向量长度lengthways milling纵铣length observation长度观察length of pipeline管线长度lengthwise cutting纵向切割