在起始条的每个需安装螺钉的孔中间，用记号笔作记号，并取下起始条。

Should be installed in the Start strip of each screw hole in the middle.

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或许你还记得，当音乐就有孔圆形盘在中间。

Perhaps you remember when music came on round discs with a hole in the middle.

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中间窗孔供三相电缆穿过。

The middle hole is used for cable going through.

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中间窗孔供三相电缆穿过。

The middle hole is used for cable going through.

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