| 单词 | cross hairs |
| 释义 | cross hairs 1. Also called cross wires. fine wires or fibers, strands of spider web, or the like, crossing in a focal plane of an optical instrument to center a target or object or to define a line of sight. 2. marks for aiding in the positioning of overlaying images for correct registration in printing. Cf. register (def. 11b). [1880-85] |
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