A rear sight of a firearm consisting of an adjustable eyepiece with a small opening through which the front sight and the target are aligned.
英
美
- 觇视孔，准门，照门：一个由可调整且有小开口的目镜组成的武器后瞄准镜，通过瞄准镜开口使前瞄准镜和目标成一直线
- 今日热词
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- 深远海浮式风电平台 - deep-sea floating wind power platform
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- 京雄高速公路 - Beijing-Xiongan expressway
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- 农业及相关产业增加值 - the added value of agriculture and related industries
