在指定的周框内绘制目前视觉化样式项目的背景影像。
Draws the background image of the current visual style element within the specified bounding rectangle.
在可看见区域内容的显示模式中，也可看见区域背景影像。
The background image for a zone is visible in all display modes in which a zone's contents are visible.
结果是这些背景星系的多重影像被扭曲成长而暗的弧——透镜效应的例子，类似于透过酒瓶底的玻璃看远处的街灯。
As a result, multiple images of these background galaxies are distorted into long faint arcs — a simple lensing effect analogous to viewing distant street lamps through a glass of wine.
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