相切是平面上的圆与另一个几何形状的一种位置关系。 若直线与曲线交于两点,且这两点无限相近,趋于重合时,该直线就是该曲线在该点的切线。初中数学中,若一条直线垂直于圆的半径且过圆的半径的外端,称这条直线与圆相切。 这里,“另一个几何形状”是圆或直线时,两者之间只有一个交点(公共点),当“另一个几何形状”是多边形时,圆与多边形的每条边之间仅有一个交点。这个交点即为切点。
他关了与法院广场相切的那条街上的办公室门,走过了两条街回到家。
He closed his office on the street tangential to the courthouse square and walked the two blocks to his house..
速度向量总是与曲线相切的。
So, the velocity vector is going to be always tangent to the curve.
它是与等值面相切的,对不对?
That limit will be some arrow we can call the velocity at the time and it will always be tangent to the curve.
那个极限也就是一个矢量,我们称之为瞬时速度,并且它总是和轨迹相切的
So the velocity at any part of the curve is tangent to the curve at that point.
曲线上任意一点的速度,都在该点和曲线相切
That means that you want to pick, ultimately, a point on this-- this line is tangent to the efficient portfolio frontier with all the other assets in it.
那意味着你会最终会在这上面选一个点-,这条直线是与有效边界相切的,后者包含了所有的资产组合。
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