The aim of the three front-line basic knowledge to understand, to grasp initially, but unskilled.
对三点一线的瞄准基本常识能够理解，能够初步掌握但不熟练。
The aim of the three-point line and other auxiliary sight to understand, to master.
对三点一线的瞄准和其他辅助瞄准具能够理解，能够较熟练掌握。
The aim of the three-point line and other auxiliary sight to understand, to master.
对三点一线的瞄准和其他辅助瞄准具能够理解，能够较熟练掌握。
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