交叉瞄准线视差 parallax of cross hairs
基准瞄视线 referenced line of sight
视线角瞄准角 angle of sight
瞄准线 视线
Aiming line of sight
以上为机器翻译结果，长、整句建议使用 人工翻译 。
十九世纪初的火炮瞄准具由炮身前后两个尖点构成，视线通过两尖点顶端就得出与火炮炮膛平行的瞄准线。
Gun sights introduced early in the nineteenth century consisted of fixed front and rear sight points so adjusted that the line of sight across their tips was parallel to the bore of the gun.
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