| 释义 |
axis 1. In geometry and optics, a straight line, either real or imaginary, around which a body or figure, or parts thereof, are symmetrically or evenly arranged or composed. In an optical fiber, for example, the axis is the centerpoint of a cross-section. 2. In optics, an imaginary line perpendicular to the center of a lens or mirror. 74570c02.qxd 9/11/07 12:18 PM Page 51 |