中軸

(1)axis consisting of a short shaft that supports something that turns

(2)回転する物を支持する、短いシャフトから成る軸

(3)a small group of indispensable persons or things; "five periodicals make up the core of their publishing program"

(4)どうしても欠かせない人や物の小グループ

(5)a straight line through a body or figure that satisfies certain conditions

(6)物体や形状を通る、ある条件を満たす直線