n.正切；突然转移话题；突兀的转向；（铁路或道路的）直线区间adj.正切的；相切的；切线的；离题的 变形： 复数：tangents 英英释义： tangent[ 'tændʒənt ]n.a straight line or plane that touches a curve or curved surface at a point but does not intersect it at that pointratio of the opposite to the adjacent side of a