只是它后面的瞄准线太高。

But it has the rear sight too high.

瞄准线，平直度

Straightness of line of sight

然后她可以用铅笔淡淡地标出一条瞄准线.

She can then mark faintly in pencil an aim line.

针对两自由度稳瞄转台提出了行进间瞄准线两级稳定策略。

This paper presents a two-level strategy for stabilizing the line of sight (LOS) using rotary table with two-degree of freedom while moving.