绿色背景上的黑色侧影固执地旋转着，就像是附在唱机唱盘上的人像侧影一样。

Against the green background, the black profiles whirl obstinately like those cut-out silhouettes that are attached to a phonograph's turntable.

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首先，styles用于定义可重用的绿色背景。

First, a styles section is used to define the reusable green background.

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隧道和车站内部的景象将稍后在计算机的帮助下被添加在绿色背景上。

Tunnel views and station interiors will be later laid on the green background with the help of computer.

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