Pertaining to, or connected with, the middle of anything.

中央的；中间的。

The middle number in a series.

(一串数字的)中间数。

A straight line drawn form the vertex of a triangle to center of the opposite side.

【数】中现(三角形的一角和对边中点的连线)。

The center strip, as of lawn, dividing opposing traffic lanes in a dual highway.

中心线；分界线(在双向公路中间，以安全岛等物分隔两边道路的界线)。