A straight line about which a body may rotate or turn.

轴。

A line about which all parts are symmetrically placed.

轴线；中枢。

Fixed straight line along which distances are measured or used for reference.

【数】(几何)座标轴(沿此线可作距离测量或参考之用者)。

Germany, Italy, and Japan and their allies in World War II.

轴心国(二次世界大战时，德、义、日及其盟国)。