英语语法分析

Ed glass, sharp to the edges, excellent in its category, eyecup adjustable.

ED玻璃，边远很锐，同类型中表现优异，眼罩可调节。

First focus the reticle with the image field boundary by turning the eyecup.

首先在图像的边界对准十字线旋转眼杯。

Without the eyecup in place, eye position did become somewhat more critical, although I still had little trouble getting my eye in the right spot to fully view the field.

去除眼罩后，眼睛的位置变得略微更加灵活，尽管我在寻找合适的位置以便看到完整的视场时遇到了一点麻烦。