“sighting bar”的概念、定义、翻译、参考文献-科学参考

单词	sighting bar
释义	sighting bar [`sīd·iŋ ´bär] ^ORDNANCE Wooden device with enlarged front and rear sight, eyepiece, and a movable target, used for training in the proper method of aiming a small-arms weapon; the eyepiece forces the student to hold the eye in proper position; because of the size of the sights, errors of aiming are very apparent.
随便看	underdraft underdrain underdrive press underearth underfeed stoker underfill underfit stream underfloor raceway underflow underflow conduit underground underground burst underground gasification underground geology underground glory-hole method underground ice underground milling underground stem underground stream underhand stoping underhand work underhead crack underhole underhung crane underlap

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