在底片效果的图像里，十字准线标记出现在天空背景中。
The crosshairs show up in the sky in the negative of the photograph.
光标仅沿着曲线移动，十字准线显示指定的垂足和切线扩展到曲线的任意一点。
Crosshairs appear to indicate the perpendicular and tangent lines that extend from any point on the curve.
使用十字瞄准线单击要查看信息的窗口。
Use the crosshairs to click on the window for which you want information.
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