单词	backsight
释义	backsight /ˈbaksʌɪt / noun 1The sight of a rifle or other weapon that is nearer the eye of the person aiming.The first M91 / 30 rifles therefore, used the curved backsights of the old dragoon rifles.... He ran his thumb along his rifle's backsight. The Model 41 has an undercut square post foresight, but its backsight attracted interest since it is mounted on a rib extending rearwards from the barrel. 2 Surveying A sight or reading taken backwards or towards the point of starting.Taking backsights is a way of detecting errors and blunders in reading instruments.... The first reading of almost any survey job should be a backsight onto a fixed point of reference, usually a benchmark of some sort. If your party is recording corrected backsights be sure to read the upper scale if you are shooting a backsight.
随便看	reducable reduce reduceable reduced circumstances reduced eye reduced iron reduceless reducement reducent reducer reduce someone to the ranks reducibility reducible reducing agent reducing belt reducing furnace reducing gear reducing machine reducing press reducing sugar reducing tee reducing treatment reducing valve reduct undefeatable

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